the Zopfli bindings are finally available from PyPI, change url in the docstring

Lib/fontTools/subset/__init__.py

@@ -116,7 +116,7 @@ Output options:
       Use the Google Zopfli algorithm to compress WOFF. The output is 3-8 %
       smaller than pure zlib, but the compression speed is much slower.
       The Zopfli Python bindings are available at:
-      https://github.com/anthrotype/py-zopfli
+      https://pypi.python.org/pypi/zopfli
 
 Glyph set expansion:
   These options control how additional glyphs are added to the subset.

Lib/fontTools/ttLib/sfnt.py

@@ -137,7 +137,7 @@ class SFNTReader(object):
 ZLIB_COMPRESSION_LEVEL = 6
 
 # if set to True, use zopfli instead of zlib for compressing WOFF 1.0.
-# The Python bindings are available at https://github.com/anthrotype/py-zopfli
+# The Python bindings are available at https://pypi.python.org/pypi/zopfli
 USE_ZOPFLI = False
 
 # mapping between zlib's compression levels and zopfli's 'numiterations'.

Lib/fontTools/ttx.py

@@ -77,7 +77,7 @@ usage: ttx [options] inputfile1 [... inputfileN]
       or 'woff2'. Note that WOFF2 requires the Brotli Python extension,
       available at https://github.com/google/brotli
     --with-zopfli Use Zopfli instead of Zlib to compress WOFF. The Python
-      extension is available at https://github.com/anthrotype/py-zopfli
+      extension is available at https://pypi.python.org/pypi/zopfli
 """