rel(1.4.1): Update CHANGES, pin niworkflows and smriprep [skip ci]

Author: oesteban

CHANGES.rst

@@ -1,5 +1,5 @@
-1.4.1 (TBD)
-===========
+1.4.1 (July 9, 2019)
+====================
 
 As of 1.4.1, the new infant and pediatric templates added to TemplateFlow are available to
 brain extraction and spatial normalization.

setup.cfg

@@ -25,8 +25,8 @@ setup_requires =
     numpy
     cython
 install_requires =
-    niworkflows >=0.9.6rc3,<0.10.0a0
-    smriprep >=0.2.4rc2,<0.3.0
+    niworkflows >=0.9.6,<0.10.0a0
+    smriprep >=0.2.4,<0.3.0
     templateflow >=0.3.0,<0.4.0a0
     nibabel >=2.2.1
     indexed_gzip >=0.8.8