Copy wiki URLs correctly

Author: Wliu

lib/github-file.js

@@ -153,7 +153,9 @@ export default class GitHubFile {
     const encodedSHA = this.encodeSegments(this.sha())
     const repoRelativePath = this.repoRelativePath()
 
-    if (this.isGistURL(gitHubRepoURL)) {
+    if (this.isGitHubWikiURL(gitHubRepoURL)) {
+      return `${gitHubRepoURL.slice(0, -5)}/wiki/${this.extractFileName(repoRelativePath)}/${encodedSHA}`
+    } else if (this.isGistURL(gitHubRepoURL)) {
       return `${gitHubRepoURL}/${encodedSHA}#file-${this.encodeSegments(repoRelativePath.replace(/\./g, '-'))}`
     } else {
       return `${gitHubRepoURL}/blob/${encodedSHA}/${this.encodeSegments(repoRelativePath)}`