Simplify `branch_name` in bin/changelog

The `--short` option has existed since at least 1.8.1: https://git-scm.com/docs/git-symbolic-ref/1.8.1

Simplify `branch_name` in bin/changelog
614fcfc4 · Robert Speicher · 14046b9c · 614fcfc4
Commit 614fcfc4 authored Dec 02, 2016 by Robert Speicher
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changelog bin/changelog +1 -1

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--- a/bin/changelog
+++ b/bin/changelog
@@ -158,7 +158,7 @@ class ChangelogEntry
  end

  def branch_name
-    @branch_name ||= %x{git symbolic-ref HEAD}.strip.sub(%r{\Arefs/heads/}, '')
+    @branch_name ||= %x{git symbolic-ref --short HEAD}.strip
  end
 end