chore(instrumentation-grpc): add prepare command and propose 0.0.5 (#118)

Author: kjin

packages/opencensus-instrumentation-grpc/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@opencensus/instrumentation-grpc",
-  "version": "0.0.4",
+  "version": "0.0.5",
   "description": "Opencensus grpc automatic instrumentation package.",
   "main": "build/src/index.js",
   "types": "build/src/index.d.ts",
@@ -11,6 +11,7 @@
     "check": "gts check",
     "compile": "tsc -p .",
     "fix": "gts fix",
+    "prepare": "npm run compile",
     "pretest": "npm run compile; npm run copy-fixtures",
     "posttest": "npm run check",
     "copy-fixtures": "cp -r ./test/fixtures ./build/test/"