Update CI

Author: ctreffs

.travis.yml

@@ -1,24 +1,17 @@
 os:
-  - linux
   - osx
 language: generic
 sudo: required
 dist: bionic
 osx_image: xcode11
 addons:
-  apt:
-    update: true
-    packages:
-      - pkg-config
-      - libassimp-dev
   homebrew:
     update: true
     packages:
       - pkg-config
       - assimp
 install:
-  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"; fi
-  - make copyMacPkgConfig501 # Temporary fix for assimp issue <https://github.com/assimp/assimp/issues/3174>
+  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then eval "$(make copyMacPkgConfig501)"; fi # Temporary fix for assimp issue <https://github.com/assimp/assimp/issues/3174>
 script:
   - swift package reset
   - swift build