Version bump to v5.1.1

Onur R. Bingol · Onur R. Bingol · commit d70347deb5ea · 2019-02-26T19:44:03.000-06:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # geomdl Changelog
 
+## v5.1.1 released on 2019-02-26
+
+* Fix a bug while taking the surface derivative
+
 ## v5.1.0 released on 2019-02-25
 
 * Added `alpha` configuration directive to `VisMPL` to control opacity of the evaluated points
diff --git a/geomdl/__init__.py b/geomdl/__init__.py
@@ -5,7 +5,7 @@
 """
 
 # Library version
-__version__ = "5.1.0"
+__version__ = "5.1.1"
 
 # Author and licence
 __author__ = "Onur Rauf Bingol"
