run tests on bionic

.travis.yml

@@ -1,26 +1,18 @@
-dist: trusty
+dist: bionic
 sudo: required
 
 language: c
 
-addons:
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test
-    - llvm-toolchain-precise-3.8
-    packages:
-    - clang-3.8
-
-install:
+before_install:
     - sudo apt-get update -qq
-    - sudo apt-get install libtommath-dev libgmp-dev valgrind
+    - sudo apt-get install -y clang libtommath-dev libgmp-dev libtfm-dev valgrind
 
 before_script:
   - gem install coveralls-lcov
   - curl http://ftp.de.debian.org/debian/pool/main/l/lcov/lcov_1.11.orig.tar.gz | tar xz
   - export PATH=$PATH:`pwd`/lcov-1.11/bin
   - curl -s https://packagecloud.io/install/repositories/libtom/packages/script.deb.sh | sudo bash
-  - sudo apt-get install libtfm-dev=0.13-5 libtommath-dev=1.0-5
+  - sudo apt-get install libtfm1=0.13-5ubuntu1
 
 matrix:
   fast_finish: true