version number update in readme (#712)

Summary:
This is a small fix. I updated the version number in readme.md from 0.1.0 to 0.2.2.
Pull Request resolved: https://github.com/facebookresearch/fastText/pull/712

Differential Revision: D13751218

Pulled By: EdouardGrave

fbshipit-source-id: 809e3345d680c2f19eddb6072d9f1b1335c9dcae

README.md

@@ -89,9 +89,9 @@ There is also the master branch that contains all of our most recent work, but c
 ### Building fastText using make (preferred)
 
 ```
-$ wget https://github.com/facebookresearch/fastText/archive/v0.1.0.zip
-$ unzip v0.1.0.zip
-$ cd fastText-0.1.0
+$ wget https://github.com/facebookresearch/fastText/archive/v0.2.0.zip
+$ unzip v0.2.0.zip
+$ cd fastText-0.2.0
 $ make
 ```