Update dependencies

npm install -g npm-check-updates
ncu -u -x mocha

Author: aminya

package.json

@@ -66,39 +66,39 @@
   "dependencies": {
     "callsites": "^3.1.0",
     "debug": "^4.1.1",
-    "is-observable": "^1.1.0",
+    "is-observable": "^2.1.0",
     "observable-fns": "^0.5.1"
   },
   "devDependencies": {
-    "@types/chai": "^4.1.7",
-    "@types/debug": "^4.1.4",
-    "@types/execa": "^0.9.0",
-    "@types/mocha": "^5.2.6",
-    "@types/node": "^11.13.8",
-    "@types/webpack": "^4.4.32",
-    "ava": "^2.4.0",
+    "@types/chai": "^4.2.12",
+    "@types/debug": "^4.1.5",
+    "@types/execa": "^2.0.0",
+    "@types/mocha": "^8.0.3",
+    "@types/node": "^14.6.4",
+    "@types/webpack": "^4.41.22",
+    "ava": "^3.12.1",
     "chai": "^4.2.0",
-    "cross-env": "^5.2.0",
-    "execa": "^3.4.0",
+    "cross-env": "^7.0.2",
+    "execa": "^4.0.3",
     "mocha": "^5.2.0",
     "npm-run-all": "^4.1.5",
     "puppet-run": "^0.11.1",
     "puppet-run-plugin-mocha": "^0.10.0-alpha",
     "raw-loader": "^4.0.1",
-    "rimraf": "^2.6.3",
-    "rollup": "^1.16.2",
-    "rollup-plugin-commonjs": "^10.0.1",
-    "rollup-plugin-node-resolve": "^5.1.0",
-    "threads-plugin": "^1.2.0",
+    "rimraf": "^3.0.2",
+    "rollup": "^2.26.10",
+    "rollup-plugin-commonjs": "^10.1.0",
+    "rollup-plugin-node-resolve": "^5.2.0",
+    "threads-plugin": "^1.3.3",
     "tiny-worker": "^2.2.0",
-    "ts-loader": "^6.0.1",
-    "ts-node": "^8.10.2",
-    "tslint": "^5.16.0",
+    "ts-loader": "^8.0.3",
+    "ts-node": "^9.0.0",
+    "tslint": "^6.1.3",
     "tslint-config-prettier": "^1.18.0",
-    "typescript": "^3.9.5",
+    "typescript": "^4.0.2",
     "wavy": "^1.0.4",
-    "webpack": "^4.32.2",
-    "worker-plugin": "^3.1.0"
+    "webpack": "^4.44.1",
+    "worker-plugin": "^5.0.0"
   },
   "optionalDependencies": {
     "tiny-worker": ">= 2"