feat: mobx 5 support

package.json

@@ -20,13 +20,6 @@
     "commit": "git add . && git-cz && git push origin",
     "watch:build": "babel --watch -d lib/ src/",
     "watch:test": "npm run test -- -w",
-    "switch:mobx": "replace \"from 'mobx5'\" \"from 'mobx'\" src -r",
-    "switch:mobx5": "replace \"from 'mobx4'\" \"from 'mobx5'\" src -r",
-    "switch:mobx4": "replace \"from 'mobx3'\" \"from 'mobx4'\" src -r",
-    "switch:mobx3": "replace \"from 'mobx'\" \"from 'mobx3'\" src -r",
-    "test:mobx5": "npm run switch:mobx5 && cross-env TEST=true mocha tests --compilers js:babel-register",
-    "test:mobx4": "npm run switch:mobx4 && cross-env TEST=true mocha tests --compilers js:babel-register",
-    "test:mobx3": "npm run switch:mobx3 && cross-env TEST=true mocha tests --compilers js:babel-register",
     "cover": "nyc npm test",
     "coverage:check": "nyc check-coverage --satements 0 --branches 0 --functions 0 --lines 0",
     "coverage:report": "nyc report --reporter=text-lcov > coverage.lcov && codecov",
@@ -96,9 +89,6 @@
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-react": "^7.4.0",
     "husky": "^0.12.0",
-    "mobx3": "npm:mobx@^3.0.0",
-    "mobx4": "npm:mobx@^4.0.0",
-    "mobx5": "npm:mobx@^5.0.0",
     "mocha": "3.2.0",
     "npm-run-all": "3.1.2",
     "nyc": "10.0.0",