Fix direct link to a file

The `/tree/` links are meant for directories, `/blob/` leads to an exact
file. This allowed a simplification of the `docsUrl` function since the
default branch can be treated as a "commit hash".

src/docsUrl.js

@@ -1,10 +1,5 @@
 const repoUrl = 'https://github.com/benmosher/eslint-plugin-import'
 
-export default function docsUrl(ruleName, commitHash) {
-  let baseUrl = `${repoUrl}/tree/master/docs/rules`
-  if (commitHash) {
-    baseUrl = `${repoUrl}/blob/${commitHash}/docs/rules`
-  }
-
-  return `${baseUrl}/${ruleName}.md`
+export default function docsUrl(ruleName, commitHash = 'master') {
+  return `${repoUrl}/blob/${commitHash}/docs/rules/${ruleName}.md`
 }

tests/src/core/docsUrl.js

@@ -4,7 +4,7 @@ import docsUrl from '../../../src/docsUrl'
 
 describe('docsUrl', function () {
   it('returns the rule documentation URL when given a rule name', function () {
-    expect(docsUrl('foo')).to.equal('https://github.com/benmosher/eslint-plugin-import/tree/master/docs/rules/foo.md')
+    expect(docsUrl('foo')).to.equal('https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/foo.md')
   })
 
   it('supports an optional commit hash parameter', function () {