(maint) Update dependencies

This commit updates the following dependencies:

- @types/mocha to 5.2.5
- @types/node to 10.2.10
- typescript to 3.1.6
- vscode to 1.1.21
- vscode-languageclient to 5.1.1

Author: jpogran

package-lock.json

@@ -428,15 +428,15 @@
     "test": "npm run compile && node ./node_modules/vscode/bin/test"
   },
   "devDependencies": {
-    "@types/mocha": "^2.2.32",
-    "@types/node": "^9.4.7",
+    "@types/mocha": "^5.2.5",
+    "@types/node": "^10.12.10",
     "del": "^3.0.0",
     "gulp": "^4.0.0",
     "gulp-bump": "^3.1.0",
-    "typescript": "2.9.x",
+    "typescript": "3.1.6",
     "tslint": "^5.11.0",
     "vsce": "^1.18.0",
-    "vscode": "^1.0",
+    "vscode": "^1.1.21",
     "yargs": "^11.0.0",
     "gulp-downloader": "^1.0.4",
     "gulp-decompress": "^2.0.2",
@@ -445,7 +445,7 @@
     "event-stream": "< 3.3.4"
   },
   "dependencies": {
-    "vscode-languageclient": "5.1.0",
+    "vscode-languageclient": "5.1.1",
     "vscode-extension-telemetry": "0.0.22",
     "viz.js": "~1.7.0",
     "vscode-debugprotocol": "^1.19.0",