Use Ruby methods, not Rails' String#first

Gitaly-Ruby is not a Rails application, which made the method not exist after the vendor. This patch uses direct indexing, which has the same properties that `#first` has. Found while working on: https://gitlab.com/gitlab-org/gitaly/merge_requests/699

Use Ruby methods, not Rails' String#first
5e75d377 · Zeger-Jan van de Weg · 87f1736a · 5e75d377
Unverified Commit 5e75d377 authored May 01, 2018 by Zeger-Jan van de Weg
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raw_diff_change.rb lib/gitlab/git/raw_diff_change.rb +3 -1

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--- a/lib/gitlab/git/raw_diff_change.rb
+++ b/lib/gitlab/git/raw_diff_change.rb
@@ -38,7 +38,9 @@ module Gitlab
      end

      def extract_operation
-        case @raw_operation&.first(1)
+        return :unknown unless @raw_operation
+
+        case @raw_operation[0]
        when 'A'
          :added
        when 'C'