MAINT: Revert to 1.17.1 for release (#1519)

diff --git a/codespell_lib/_codespell.py b/codespell_lib/_codespell.py
index 3e333df..9eb7f8a 100755
--- a/codespell_lib/_codespell.py
+++ b/codespell_lib/_codespell.py
@@ -31,7 +31,7 @@
 USAGE = """
 \t%prog [OPTIONS] [file1 file2 ... fileN]
 """
-VERSION = '1.18.dev0'
+VERSION = '1.17.1'
 
 # Users might want to link this file into /usr/local/bin, so we resolve the
 # symbolic link path to the real path if necessary.