Update dependencies (#37)

Author: kristoferbaxter

package.json

@@ -28,7 +28,7 @@
     "@ampproject/filesize": "4.2.0",
     "@ampproject/rollup-plugin-closure-compiler": "0.26.0",
     "@types/chai": "4.2.11",
-    "@types/mocha": "5.2.7",
+    "@types/mocha": "7.0.2",
     "acorn-walk": "7.1.1",
     "chai": "4.2.0",
     "http-server": "0.12.3",
@@ -37,12 +37,12 @@
     "karma-chrome-launcher": "3.1.0",
     "karma-firefox-launcher": "1.3.0",
     "karma-ie-launcher": "1.0.0",
-    "karma-mocha": "1.3.0",
+    "karma-mocha": "2.0.1",
     "karma-typescript": "5.0.3",
     "magic-string": "0.25.7",
-    "mocha": "6.2.3",
+    "mocha": "8.0.1",
     "opener": "1.5.1",
-    "rollup": "2.12.1",
+    "rollup": "2.15.0",
     "rollup-plugin-commonjs": "10.1.0",
     "rollup-plugin-node-resolve": "5.2.0",
     "rollup-plugin-typescript": "1.0.1",