fix: changing commit format to support py3

Author: satra

nipype/COMMIT_INFO.txt

@@ -1,6 +1,6 @@
 # This is an ini file that may contain information about the code state
 [commit hash]
 # The line below may contain a valid hash if it has been substituted during 'git archive'
-archive_subst_hash=$Format:%h$
+archive_subst_hash=$Format:%%h$
 # This line may be modified by the install process
 install_hash=