Fix broken builds

Author: seratch

.gitignore

@@ -13,3 +13,5 @@ tests/.cache
 .cache
 .DS_Store
 .vscode/
+.eggs/
+build/

requirements-dev.txt

@@ -1,11 +1,12 @@
 coveralls==1.1
 ipdb==0.9.3
 ipython==4.1.2
-pdbpp==0.8.3
+pdbpp==0.10.2
 pytest>=3.2.0,<4.0.0
 pytest-flask==0.10.0
 pytest-mock>=1.6.3
 pytest-cov==2.5.1
 pytest-pythonpath==0.7.1
 testfixtures==5.3.1
-tox==2.9.1
+tox==2.9.1
+werkzeug==0.16.1