Use UTF-8 encoding when getting information about a symbolic reference

Fixes gitpython-developers#774

Author: Harmon758

Diff for: doc/source/changes.rst

@@ -8,6 +8,12 @@ Unreleased
 * Restricted GitDB (gitdb2) version requirement to < 4
 * Removed old nose library from test requirements
 
+Bugfixes
+--------
+
+* Changed to use UTF-8 instead of default encoding when getting information about a symbolic reference
+  (`#774 <https://github.com/gitpython-developers/GitPython/issues/774>`_)
+
 3.0.8
 =====
 

Diff for: git/refs/symbolic.py

@@ -142,7 +142,7 @@ def _get_ref_info_helper(cls, repo, ref_path):
         tokens = None
         repodir = _git_dir(repo, ref_path)
         try:
-            with open(osp.join(repodir, ref_path), 'rt') as fp:
+            with open(osp.join(repodir, ref_path), 'rt', encoding = 'UTF-8') as fp:
                 value = fp.read().rstrip()
             # Don't only split on spaces, but on whitespace, which allows to parse lines like
             # 60b64ef992065e2600bfef6187a97f92398a9144                branch 'master' of git-server:/path/to/repo