chore(package): update standard-version to version 7.1.0

Closes #29

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "rollup-plugin-uglify": "6.0.1",
     "shx": "0.3.2",
     "sort-object-keys": "1.1.2",
-    "standard-version": "4.4.0",
+    "standard-version": "7.1.0",
     "strip-json-comments-cli": "1.0.1",
     "ts-jest": "23.10.5",
     "tslib": "1.9.3",