message: Fix typos in README
  There were some extra apostrophes.
diff: @@ -211,7 +211,7 @@ fn main() {
  Tarpaulin aims to be easy to add to your CI workflow. With well tested support
  for Travis-CI it also supports sending CI specific meta-data to coveralls.io for
  -Circle, Semaphore, Jenkins and Codeship (though only Jenkin's has been tested).
  +Circle, Semaphore, Jenkins and Codeship (though only Jenkins has been tested).
  You can also use Tarpaulin on Azure, check out
  [crate-ci/azure-pipelines](https://github.com/crate-ci/azure-pipelines) for an
  @@ -395,7 +395,7 @@ this purpose, and its documentation describes how to use it with Tarpaulin.
  [`pycobertura`](https://pypi.python.org/pypi/pycobertura) is a python library
  for working with cobertura reports. It offers a report diffing tool as well as
  -it's own report implementations.
  +its own report implementations.
  To generate a `cobertura.xml` simply run the following tarpaulin command:
  