give up on travis

.travis.yml

@@ -1,24 +1,12 @@
-sudo: required
-dist: bionic
-language: generic
-# compiler:
-#   - clang
-#   - gcc
+dist: trusty
+language: c
 compiler: gcc
-cache: pip
-python: 3
-
 addons:
   apt:
+    sources:
+      - ubuntu-toolchain-r-test
     packages:
-      - python3
-      - python3.6-venv
-
-install:
-  - env
-  # - make env3
-
+      - gcc-7
 script:
-  # - env3/bin/black --check --skip-string-normalization tools/
-  # - env3/bin/python tools/solotool.py -h
+  - export CC=gcc-7
   - make test