Change version, 1.01 -> 1.1

Sorry to bother you again, but...

I was reading the R-ext manual, and it say not to use version numbers like 1.01, 1.02, ..., but rather use 1.1, 1.2, ...

(The 1.01 was [my fault](https://github.com/alyssafrazee/RSkittleBrewer/commit/518b68c9).)