Bug: visualization: mpl_style
Bug: visualization: mpl_style

In the current setting axis labels are printed white on a white background.
This clearly is a bug, thus I don't increase the version number of astropy_style, but rather I suggest to fix in in the current setup.
(When I wrote that "version scheme" for the styles originally, I envisioned it for different artistic choices, not for bugs that make parts of the plot unreadable.)

@mdboom
saimn/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,mhvk/astropy,astropy/astropy,saimn/astropy,astropy/astropy,kelle/astropy,stargaser/astropy,bsipocz/astropy,larrybradley/astropy,stargaser/astropy,MSeifert04/astropy,pllim/astropy,lpsinger/astropy,tbabej/astropy,StuartLittlefair/astropy,bsipocz/astropy,mhvk/astropy,mhvk/astropy,kelle/astropy,funbaker/astropy,MSeifert04/astropy,bsipocz/astropy,joergdietrich/astropy,saimn/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,dhomeier/astropy,larrybradley/astropy,StuartLittlefair/astropy,astropy/astropy,funbaker/astropy,astropy/astropy,pllim/astropy,kelle/astropy,DougBurke/astropy,AustereCuriosity/astropy,lpsinger/astropy,kelle/astropy,dhomeier/astropy,larrybradley/astropy,mhvk/astropy,lpsinger/astropy,tbabej/astropy,tbabej/astropy,lpsinger/astropy,AustereCuriosity/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,saimn/astropy,stargaser/astropy,tbabej/astropy,astropy/astropy,DougBurke/astropy,lpsinger/astropy,larrybradley/astropy,joergdietrich/astropy,pllim/astropy,pllim/astropy,funbaker/astropy,joergdietrich/astropy,bsipocz/astropy,joergdietrich/astropy,MSeifert04/astropy,MSeifert04/astropy,DougBurke/astropy,aleksandr-bakanov/astropy,tbabej/astropy,joergdietrich/astropy,AustereCuriosity/astropy,saimn/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,stargaser/astropy,mhvk/astropy,kelle/astropy,funbaker/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,DougBurke/astropy,pllim/astropy,dhomeier/astropy