MAINT: Increase minimal nibabel required version to 3.0.1

See travis errors in nipreps#76,nipreps#77, nipreps#78, etc.

Author: arokem

setup.cfg

@@ -22,7 +22,7 @@ python_requires = >=3.5
 install_requires =
     dipy >=1.0.0
     indexed_gzip >=0.8.8
-    nibabel ~= 3.0.0rc1
+    nibabel ~= 3.0.1
     nipype ~= 1.3.1
     niworkflows ~= 1.1.3
     numpy