message: Updated readme per
diff: @@ -139,6 +139,11 @@ with a verbose run of tarpaulin to see the test results as well as coverage outp
  For codecov.io you'll need to export CODECOV_TOKEN are instructions on this in
  the settings of your codecov project.
  +Because of the use of nightly proc-macro features you'll need to reinstall
  +tarpaulin each time unless you're keeping to a specific nightly version. If you
  +are keeping to a specific nightly you can remove the `-f` flag in the example
  +travis file.
  +
  ```yml
  language: rust
  sudo: required
  @@ -158,7 +163,7 @@ matrix:
  before_cache: |
  if [[ "$TRAVIS_RUST_VERSION" == nightly ]]; then
  - RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install cargo-tarpaulin
  + RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install cargo-tarpaulin -f
  fi
  script:
  