Rename manifest.json to plugin-manifest.json

Flatpak uses already manifest.json

acronyms_expander/plugin-manifest.json

@@ -0,0 +1,20 @@
+{
+    "authors": [
+        "Philipp Hörist <philipp@hoerist.com>",
+        "Mateusz Biliński <mateusz@bilinski.it>"
+    ],
+    "description": "Replaces acronyms (or other strings) with given expansions/substitutes.",
+    "homepage": "https://dev.gajim.org/gajim/gajim-plugins/wikis/AcronymsExpanderPlugin",
+    "config_dialog": true,
+    "name": "Acronyms Expander",
+    "platforms": [
+        "linux",
+        "darwin",
+        "win32"
+    ],
+    "requirements": [
+        "gajim>=1.4.0"
+    ],
+    "short_name": "acronyms_expander",
+    "version": "1.4.4"
+}