Update README.md: curl -o -> curl -Lo

Github added a redirect to raw.github.com, we should follow.

README.md

@@ -14,7 +14,7 @@ Existing .travis.yml show how to ensure that all_succeeded or all_failed
 ```yaml
 #...
 script:
-  - curl -o travis_after_all.py https://raw.github.com/dmakhno/travis_after_all/master/travis_after_all.py
+  - curl -Lo travis_after_all.py https://raw.github.com/dmakhno/travis_after_all/master/travis_after_all.py
 after_success:
   - python travis_after_all.py
   - export $(cat .to_export_back)
@@ -46,4 +46,4 @@ Limitations/Todo
 
 - If other jobs will start late, can be global build timeout. (Think of passing leader role to others, for example who started last is the leader)
 - More flexible leader defenition (In Matrix not all jobs can publish)
-- Have several leaders, according to flavours (E.g. if in Matrix slices responsible for platform)
+- Have several leaders, according to flavours (E.g. if in Matrix slices responsible for platform)