Add pytest 3.4 to the build matrix in tox

Author: nicoddemus

tox.ini

@@ -7,6 +7,7 @@
 envlist = py{27,34,35,36,py}-pytest30-supported-xdist,
           py{27,35}-pytest30-unsupported-xdist,
           py{27,34,py}-pytest31-supported-xdist
+          py{27,34,py}-pytest34-supported-xdist
 
 [testenv]
 passenv = CI TRAVIS_BUILD_ID TRAVIS TRAVIS_BRANCH TRAVIS_JOB_NUMBER TRAVIS_PULL_REQUEST TRAVIS_JOB_ID TRAVIS_REPO_SLUG TRAVIS_COMMIT
@@ -15,6 +16,7 @@ deps =
     pytest-cov
     pytest30: pytest>=3.0,<3.1
     pytest31: pytest>=3.1,<3.2
+    pytest34: pytest>=3.4,<3.5
     termcolor>=1.1.0
     supported-xdist: pytest-xdist>=1.14
     unsupported-xdist: pytest-xdist<1.14