Bump acorn from 5.7.3 to 5.7.4

Bumps [acorn](https://github.com/acornjs/acorn) from 5.7.3 to 5.7.4.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/5.7.3...5.7.4)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -1699,9 +1699,9 @@
       }
     },
     "acorn": {
-      "version": "6.3.0",
+      "version": "6.4.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.3.0.tgz",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
-      "integrity": "sha512-/czfa8BwS88b9gWQVhc8eknunSA2DoJpJyTQkhheIf5E48u1N0R4q/YxxsAeqRrmK9TQ/uYfgLDfZo91UlANIA==",
+      "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
       "dev": true
     },
     "acorn-dynamic-import": {
@@ -1736,14 +1736,6 @@
         "acorn-dynamic-import": "^4.0.0",
         "acorn-walk": "^6.1.1",
         "xtend": "^4.0.1"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "6.2.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
-          "integrity": "sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==",
-          "dev": true
-        }
       }
     },
     "acorn-walk": {
@@ -8340,14 +8332,6 @@
         "acorn": "^6.0.7",
         "acorn-jsx": "^5.0.0",
         "eslint-visitor-keys": "^1.0.0"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "6.2.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
-          "integrity": "sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==",
-          "dev": true
-        }
       }
     },
     "esprima": {
@@ -10942,12 +10926,29 @@
             "yallist": "^3.0.2"
           }
         },
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+          "dev": true
+        },
         "ms": {
           "version": "2.1.2",
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
           "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
           "dev": true
         },
+        "ndjson": {
+          "version": "github:hugomrdias/ndjson#4db16da6b42e5b39bf300c3a7cde62abb3fa3a11",
+          "from": "github:hugomrdias/ndjson#feat/readable-stream3",
+          "dev": true,
+          "requires": {
+            "json-stringify-safe": "^5.0.1",
+            "minimist": "^1.2.0",
+            "split2": "^3.1.0",
+            "through2": "^3.0.0"
+          }
+        },
         "readable-stream": {
           "version": "3.4.0",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
@@ -13128,9 +13129,9 @@
       },
       "dependencies": {
         "minimist": {
-          "version": "1.2.0",
+          "version": "1.2.5",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
           "dev": true
         },
         "through2": {
@@ -15921,9 +15922,9 @@
       },
       "dependencies": {
         "readable-stream": {
-          "version": "3.4.0",
+          "version": "3.6.0",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
-          "integrity": "sha512-jItXPLmrSR8jmTRmRWJXCnGJsfy85mB3Wd/uINMXA65yrnFo0cPClFIUWzo2najVNSl+mx7/4W8ttlLWJe99pQ==",
+          "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
           "dev": true,
           "requires": {
             "inherits": "^2.0.3",
@@ -15931,13 +15932,19 @@
             "util-deprecate": "^1.0.1"
           }
         },
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
+          "dev": true
+        },
         "string_decoder": {
-          "version": "1.2.0",
+          "version": "1.3.0",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
-          "integrity": "sha512-6YqyX6ZWEYguAxgZzHGL7SsCeGx3V2TtOTqZz1xSTSWnqsbWwbptafNyvf/ACquZUXV3DANr5BDIwNYe1mN42w==",
+          "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
           "dev": true,
           "requires": {
-            "safe-buffer": "~5.1.0"
+            "safe-buffer": "~5.2.0"
           }
         }
       }
@@ -17365,9 +17372,9 @@
       },
       "dependencies": {
         "acorn": {
-          "version": "5.7.3",
+          "version": "5.7.4",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
-          "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+          "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg==",
           "dev": true
         },
         "acorn-dynamic-import": {