travis: install libidn2

Install libidn2 to increase test coverage (IDN tests)

Closes https://github.com/curl/curl/pull/1673

diff --git a/.travis.yml b/.travis.yml
index 04e4729e1a84f2de69c2de5cea6f6ba2e4e29603..b08cf1710a894d7a5a56fcd9a7e53da14b5e6db0 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ addons:
             - g++-4.8
             - libstdc++-4.8-dev
             - stunnel4
+            - libidn2-0-dev
             - libssh2-1-dev
 
 matrix: