Remove atom runner - has multiple vun deps.

Author: damieng

package.json

@@ -20,16 +20,13 @@
     "vscode-languageserver-protocol": "3.12.0",
     "vscode-languageserver-types": "3.12.0"
   },
-  "atomTestRunner": "./build/test/runner",
   "devDependencies": {
     "@types/atom": "^1.31.0",
-    "@types/atom-mocha-test-runner": "^1.0.2",
     "@types/chai": "^4.1.7",
     "@types/fuzzaldrin-plus": "0.6.0",
     "@types/mocha": "^5.2.5",
     "@types/node": "8.9.3",
     "@types/sinon": "^4.1.3",
-    "atom-mocha-test-runner": "^1.2.0",
     "chai": "^4.2.0",
     "mocha": "^5.2.0",
     "mocha-appveyor-reporter": "^0.4.2",