[master] ffa620d bah, trusty does not have nghttp2

[Federico G. Schwindt]

commit ffa620dec2a1e9d7b21d086863eb2c6084bc644f
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Sat Mar 11 12:51:19 2017 +0000

    bah, trusty does not have nghttp2

diff --git a/.travis.yml b/.travis.yml
index a25e823..bf6a001 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,6 @@ addons:
   apt:
     packages:
     - python-docutils
-    - nghttp2
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update          ; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install docutils; fi