chore: Make dependencies semver

package.json

@@ -46,7 +46,7 @@
     "isomorphic-fetch": "^2.2.0",
     "lodash.debounce": "^4.0.3",
     "minifyify": "^7.1.0",
-    "prop-types": "15.7.2",
+    "prop-types": "^15.7.2",
     "react": "^15.6.2",
     "react-dom": "^15.6.2",
     "remark": "^8.0.0",
@@ -60,7 +60,7 @@
     "budo": "^11.0.0",
     "cpy-cli": "^2.0.0",
     "cross-env": "^5.1.6",
-    "cz-conventional-changelog": "2.1.0",
+    "cz-conventional-changelog": "^2.1.0",
     "expect": "^24.1.0",
     "mocha": "^5.0.0",
     "standard-version": "^5.0.0",