Increment version to 3.8.1

Author: tomaarsen

nltk/VERSION

@@ -1 +1 @@
-3.8.1a
+3.8.1

web/conf.py

@@ -126,9 +126,9 @@ def generate_custom_files():
 # built documents.
 #
 # The short X.Y version.
-version = "3.8.1a"
+version = "3.8.1"
 # The full version, including alpha/beta/rc tags.
-release = "3.8.1a"
+release = "3.8.1"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.