Add pgindent commit to git-blame-ignore-revs file.

Add entry for recent commit e1c1c30f.

.git-blame-ignore-revs

@@ -12,7 +12,10 @@
 #
 # Add new entries by adding the output of the following to the top of the file:
 #
-# $ git log --pretty=format:"%H # %cd %n# %s" $PGINDENTGITHASH -1
+# $ git log --pretty=format:"%H # %cd %n# %s" $PGINDENTGITHASH -1 --date=iso
+
+e1c1c30f635390b6a3ae4993e8cac213a33e6e3f # 2021-06-28 11:05:54 -0400
+# Pre branch pgindent / pgperltidy run
 
 def5b065ff22a16a80084587613599fe15627213 # 2021-05-12 13:14:10 -0400
 # Initial pgindent and pgperltidy run for v14.