Update README.md and CONTRIBUTE

Signed-off-by: Stephen L. <lrq3000@gmail.com>

CONTRIBUTE

@@ -34,7 +34,7 @@ unit tests pass. This will ensure that your changes did not introduce
 any regression in the features that already working. 
 
 To run the test, cd to the root of the tqdm folder (in the same folder 
-as this file), and then type the following:
+as this file), and then type the following (you need to install `tox`):
 
 ```
 make test

README.md

@@ -25,10 +25,10 @@ version is much more visually appealing.
 ## Installation
 
 ```sh
-# newer, faster, prettier, stable version
-pip install -e git+https://github.com/tqdm/tqdm.git@master#egg=tqdm
-# or (old version on pypi)
+# Latest stable release on pypi
 pip install tqdm
+# Latest development release on github
+pip install -e git+https://github.com/tqdm/tqdm.git@master#egg=tqdm
 ```
 
 ## Documentation
@@ -160,7 +160,7 @@ def my_hook(**kwargs):
             t.close()
             return
         t.total = tsize
-        t.update((b - last_b[0]) * bsize)
+        t.update((b - last_b[0]) * bsize) # manually update the progressbar
         last_b[0] = b
     return inner
 
@@ -190,6 +190,8 @@ $ make test
 $ make coverage
 ```
 
+See also the CONTRIBUTE file for more information.
+
 ## License
 
 [MIT LICENSE](LICENSE).
@@ -202,4 +204,4 @@ $ make coverage
 - Mikhail Korobov (kmike)
 - Hadrien Mary (hadim)
 - Casper da Costa-Luis (casperdcl)
-- Stephen L (lrq3000)
+- Stephen Larroque (lrq3000)