update

Author: ponnhide

README.md

@@ -13,7 +13,7 @@ If you want to use developmental version, it can be installed using the followin
 `pip install git+https://github.com/ponnhide/patchworklib.git`
 
 ## News
-#### 12082022: Version 0.5.0 is released.
+#### 12082022: version 0.5.0 is released.
 - New operators, "+" and "-", were added. 
 - plotnine > v0.10.x is now supported.
 - Plots generated by object-oriented seaborn interface can now be handled by patchworklib.