chore(package): update @semantic-release/github to version 5.2.6

Closes #18

Author: greenkeeper[bot]

package.json

@@ -12,7 +12,7 @@
     "@semantic-release/changelog": "^2.0.1",
     "@semantic-release/exec": "^2.2.3",
     "@semantic-release/git": "^4.0.1",
-    "@semantic-release/github": "^4.2.8",
+    "@semantic-release/github": "^5.2.6",
     "@semantic-release/npm": "^3.2.4",
     "babel-core": "^6.26.0",
     "babel-jest": "^22.4.3",