pip dropped pypy3, so will we

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 41f9e7d..7bc5f29 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,6 @@
     - TOXENV=py34
     - TOXENV=py35
     - TOXENV=pypy
-    - TOXENV=pypy3
 install: pip install coveralls tox
 script: tox
 # Special snowflake.  Our tests depend on making real commits.

tox.ini

diff --git a/tox.ini b/tox.ini
index f2ac125..b196c13 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 project = pre_commit_hooks
 # These should match the travis env list
-envlist = py27,py34,py35,pypy,pypy3
+envlist = py27,py34,py35,pypy
 
 [testenv]
 deps = -rrequirements-dev.txt