fix(deps): update dependency codemirror to v5.51.0 (#914)

Co-authored-by: WhiteSource Renovate <renovatebot@gmail.com>

Author: 2 people

docs/package.json

@@ -17,7 +17,7 @@
     "@angular/compiler": "8.2.11",
     "@angular/core": "8.2.11",
     "codelyzer": "5.1.2",
-    "codemirror": "5.49.0",
+    "codemirror": "5.51.0",
     "rxjs": "6.5.3",
     "tslint": "5.20.0",
     "typescript": "3.7.3",