Add missing fields (#11)

* fix(package.json): Add missing fields to make it more compliant with VS Code extensions fields

Change-Id: I1c63bae659c323aa2416bf57881f4385f3cfbaa9
Signed-off-by: Florent Benoit <fbenoit@redhat.com>

* fix(plugin): use the new alias name for theia packager command

Change-Id: I5782d8140d7ae79ec221c82d1c3dcda9ef9347d1
Signed-off-by: Florent Benoit <fbenoit@redhat.com>

package.json

@@ -4,6 +4,14 @@
   "keywords": [
     "theia-plugin"
   ],
+  "icon": "redhat-developer-icon.png",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/redhat-developer/omnisharp-theia-plugin"
+  },
+  "categories": [
+    "Programming Languages"
+  ],
   "version": "0.0.1",
   "license": "EPL-2.0",
   "files": [
@@ -29,7 +37,7 @@
     "format-code": "tsfmt -r",
     "watch": "tsc -watch",
     "compile": "tsc",
-    "build": "yarn run format-code && yarn run compile && theia:plugin pack"
+    "build": "yarn run format-code && yarn run compile && theia-plugin pack"
   },
   "engines": {
     "theiaPlugin": "latest",