Update dependencies

Fixes batch voting missing from the contracts ABI, plus a whole bunch of
security issues reported by npm.

package.json

@@ -27,7 +27,7 @@
     "ember-ajax": "^3.0.0",
     "ember-awesome-macros": "0.41.0",
     "ember-browserify": "^1.1.13",
-    "ember-cli": "~3.1.2",
+    "ember-cli": "^3.1.4",
     "ember-cli-app-version": "^3.0.0",
     "ember-cli-babel": "^6.6.0",
     "ember-cli-dependency-checker": "^2.0.0",
@@ -39,7 +39,7 @@
     "ember-cli-sass": "^7.2.0",
     "ember-cli-sri": "^2.1.0",
     "ember-cli-uglify": "^2.0.0",
-    "ember-cli-update": "^0.21.2",
+    "ember-cli-update": "^0.21.4",
     "ember-export-application-global": "^2.0.0",
     "ember-load-initializers": "^1.0.0",
     "ember-macro-helpers": "0.17.0",
@@ -51,7 +51,7 @@
     "eslint-plugin-ember": "^5.0.0",
     "ethers": "3.0.15",
     "kosmos-schemas": "^1.1.2",
-    "kredits-contracts": "^3.x",
+    "kredits-contracts": "^3.0.2",
     "loader.js": "^4.2.3",
     "tv4": "^1.3.0"
   },