[gmime] Use libidn2-0-dev instead

[Rico Tzschichholz <ricotz src gnome org>]

commit 87405143bb870a6977b7170706a04d747341b425
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Sat Oct 27 12:09:25 2018 -0400

    Use libidn2-0-dev instead

 .travis.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.travis.yml b/.travis.yml
index 80fc6d06..1cea6577 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ compiler:
 sudo: required
 before_install:
   - sudo apt-get -qq update
-  - sudo apt-get install -y automake gtk-doc-tools gnome-doc-utils libgpgme11 libgpgme11-dev gpgsm lcov 
libidn2-dev
+  - sudo apt-get install -y automake gtk-doc-tools gnome-doc-utils libgpgme11 libgpgme11-dev gpgsm lcov 
libidn2-0-dev
 install:
   - pip install --user cpp-coveralls
   - gem install coveralls-lcov