Something wrong with version specifiers

requirements-dev.txt

@@ -4,4 +4,4 @@ mock==2.*
 coverage==4.*
 pytest==3.*
 pytest-cov==2.*
-pytest-runner>=2.*,<=3.*
+pytest-runner>=2,<=3

requirements.txt

 six==1.*
-deprecation>=1.*,<=2.*
+deprecation>=1,<=2
 numpy==1.*
 scipy>=0.18,<2
 nibabel==2.*