Use new requirements

.travis.yml

@@ -6,8 +6,8 @@ python:
   - "3.6"
 
 install:
-  - pip install -r requirements.pip
+  - pip install -r requirements.txt
-  - pip install -r requirements.dev.pip
+  - pip install -r requirements.dev.txt
 
 script:
   - nosetests --with-coverage --cover-package gixy -v

tox.ini

@@ -4,8 +4,8 @@ skip_missing_interpreters = True
 
 [testenv]
 deps =
-    -rrequirements.pip
+    -rrequirements.txt
-    -rrequirements.dev.pip
+    -rrequirements.dev.txt
 commands = nosetests -v
 
 [testenv:flake8]