update CHANGELOG.md

'openstruct' is not a runtime dependency that pry has anymore but it
was not added to the changelog. other two changes include better messages
for older changelog entries related to config.
Merge pull request #1146 from robgleeson/changelog

update CHANGELOG.md
Clean up gem dependencies (fix #1148)

* Remove unused development dependency on open4
* Use pessimistic versioning for coderay, rake, and simplecov
* Bump versions of rake and mocha
* Loosen pessimistic versioning on mocha and bond

The only remaining warning from RubyGems is on coderay -- we chose not
to use '~> 1.1' because there were breaking changes between 1.0 and 1.1.
Merge pull request #1149 from pry/gem-deps-cleanup

Clean up gem dependencies (fix #1148)
Minor gemspec fixups

The `test_files` gemspec option seems to be pretty obsolete. I also
updated the homepage URL.
Update CONTRIBUTORS

For future reference, the command to generate this file is
`git shortlog -s -n`.
README.markdown -> README.md
Stop including unnecessary files in .gem

As suggested by Rob Gleeson in discussion on #1147. Also removed an
obsolete dotfile, because why not.
Merge pull request #1151 from pry/fewer-files-in-gem

Stop including unnecessary files in .gem
change version to 0.10.0.pre

the next version of pry will be 0.10.0 and to make sure plugins are
still working it's easier to drop the version requirement so that gems
like pry-debugger don't prevent pry from booting and so that pry-remote
is not a deactivated gem when pry boots.
Merge pull request #1154 from robgleeson/0.10.0-beta

change version to 0.10.0.pre
allow for tests to be run with ease.

'bacon spec/config_spec.rb' instead of 'bacon -I spec spec/config_spec.rb'