[.travis.yml] Updated.

.travis.yml

@@ -17,17 +17,15 @@ addons:
             - libfreetype6-dev
             - libvorbis-dev
             - libflac-dev
+            - libgl1-mesa-dev
             - libegl1-mesa-dev
             - libgles2-mesa-dev
-            - libtinyxml2-dev
+            - libxi-dev
-            - libsdl2-dev
-            - libsdl2-image-dev
-            - libsdl2-mixer-dev
-            - libsdl2-ttf-dev
             - g++-8
-            - libglm-dev
             - cmake
             - cxxtest
+            - libtinyxml2-dev
+            - libglm-dev
             - liblua5.2-dev
 
 before_install:
@@ -41,9 +39,4 @@ script:
 
 notifications:
   email: false
-  # irc:
-  #   channels:
-  #     - "irc.freenode.net#openminer"
-  #   template:
-  #     - "%{repository}/%{branch} (%{commit} - %{author}): %{build_url}: %{message}"