Drop vendoring task

tasks/vendoring.py

@@ -1,23 +0,0 @@
-from __future__ import absolute_import, print_function
-import py
-import invoke
-
-VENDOR_TARGET = py.path.local("_pytest/vendored_packages")
-GOOD_FILES = 'README.md', '__init__.py'
-
-@invoke.task()
-def remove_libs(ctx):
-    print("removing vendored libs")
-    for path in VENDOR_TARGET.listdir():
-        if path.basename not in GOOD_FILES:
-            print(" ", path)
-            path.remove()
-
-@invoke.task(pre=[remove_libs])
-def update_libs(ctx):
-    print("installing libs")
-    ctx.run("pip install -t {target} pluggy".format(target=VENDOR_TARGET))
-    ctx.run("git add {target}".format(target=VENDOR_TARGET))
-    print("Please commit to finish the update after running the tests:")
-    print()
-    print('    git commit -am "Updated vendored libs"')