fix: remove tslib dependency (#153)

Author: patrickmichalina

package-lock.json

@@ -47,8 +47,8 @@
     "@types/fs-extra": "^9.0.1",
     "@types/jest": "^25.2.3",
     "@types/node": "^14.0.5",
-    "@typescript-eslint/eslint-plugin": "^3.0.0",
-    "@typescript-eslint/parser": "^3.0.0",
+    "@typescript-eslint/eslint-plugin": "^3.0.1",
+    "@typescript-eslint/parser": "^3.0.1",
     "codecov": "^3.7.0",
     "eslint": "^7.1.0",
     "eslint-plugin-promise": "^4.2.1",
@@ -59,17 +59,14 @@
     "jest": "26.0.1",
     "jest-junit": "^10.0.0",
     "rollup": "^2.10.9",
-    "rxjs": "^6.5.4",
     "semantic-release": "^17.0.8",
     "terser": "^4.7.0",
     "ts-jest": "^26.0.0",
     "ts-node": "^8.10.1",
-    "tslib": "^2.0.0",
     "typescript": "^3.9.3"
   },
-  "peerDependencies": {
-    "tslib": ">=1.13.0",
-    "rxjs": ">=6"
+  "optionalDependencies": {
+    "rxjs": "^6"
   },
   "jest": {
     "testURL": "http://localhost",