Bugfix (travis caught it! awesome!)

Author: lukelbd

.travis.yml

@@ -6,7 +6,7 @@
 sudo: false # use container based build
 language: python
 notifications:
-    email: false
+  email: false
 
 python:
   - "3.6"

proplot/wrappers.py

@@ -2427,7 +2427,7 @@ def colorbar_wrapper(self,
     # Parse flexible input
     label = _notNone(title, label, None, names=('title', 'label'))
     locator = _notNone(ticks, locator, None, names=('ticks', 'locator'))
-    formatter = _notNone(ticklabels, formatter, 'default', names=('ticklabels', 'formatter'))
+    formatter = _notNone(ticklabels, formatter, 'auto', names=('ticklabels', 'formatter'))
     minorlocator = _notNone(minorticks, minorlocator, None, names=('minorticks', 'minorlocator'))
     ticklocation = _notNone(tickloc, ticklocation, None, names=('tickloc', 'ticklocation'))