Try manual install of backports.functools_lru_cache

ba5ff1a8 · Scott Lahteine · be00e421 · ba5ff1a8
Commit ba5ff1a8 authored 7 years ago by Scott Lahteine
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,6 +28,7 @@ before_install:
  - export PATH=${TRAVIS_BUILD_DIR}/buildroot/bin/:${PATH}

 install:
+  - pip install backports.functools_lru_cache
  - pip install -U platformio

 before_script: