chore(package): update semantic-release to version 17.0.6

Closes #22

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "zopflipng-bin": "^4.0.0"
   },
   "devDependencies": {
-    "semantic-release": "^15.0.0",
+    "semantic-release": "^17.0.6",
     "xo": "^0.18.2"
   },
   "xo": {