Add appdirs as vendored package. Ref #763.

pavement.py

@@ -12,9 +12,11 @@ def remove_all(paths):
 @task
 def update_vendored():
     vendor = Path('pkg_resources/_vendor')
+    # pip uninstall doesn't support -t, so do it manually
     remove_all(vendor.glob('packaging*'))
     remove_all(vendor.glob('six*'))
     remove_all(vendor.glob('pyparsing*'))
+    remove_all(vendor.glob('appdirs*'))
     install_args = [
         'install',
         '-r', str(vendor / 'vendored.txt'),

pkg_resources/_vendor/packaging/specifiers.py

@@ -198,7 +198,7 @@ class _IndividualSpecifier(BaseSpecifier):
                         (prereleases or self.prereleases)):
                     found_prereleases.append(version)
                 # Either this is not a prerelease, or we should have been
-                # accepting prereleases from the beginning.
+                # accepting prereleases from the begining.
                 else:
                     yielded = True
                     yield version

pkg_resources/_vendor/vendored.txt

 packaging==16.7
 pyparsing==2.1.8
 six==1.10.0
+appdirs==1.4.0

pkg_resources/extern/__init__.py

@@ -69,5 +69,5 @@ class VendorImporter:
             sys.meta_path.append(self)
 
 
-names = 'packaging', 'pyparsing', 'six'
+names = 'packaging', 'pyparsing', 'six', 'appdirs'
 VendorImporter(__name__, names).install()