Add notes about adding request params manually

I spent a little time trying to figure out how to include params, and thought it would be nice to include in the readme since it ends up being so easy, after you know how it works :)
Typo in last Readme edit
Adding documentation on how to enable param logging
Require ActiveSupport::Deprecation explicitly

This commit fixes test failures with Rails 4.1.X

    Failure/Error: before { ActiveSupport::Deprecation.silence { Lograge.setup(app_config) } }
    NameError:
      uninitialized constant ActiveSupport::Deprecation
    # ./spec/lograge_spec.rb:51:in `block (3 levels) in <top (required)>'

See https://travis-ci.org/roidrage/lograge/jobs/25210263#L86
Test with AP 3.2 and 4.0 on Travis
Merge pull request #74 from splattael/require-as-deprecation

Require ActiveSupport::Deprecation explicitly
Travis: Test on latest Ruby versions available
Add missing JSON formatter to README
Merge pull request #76 from splattael/lastest-ruby

Travis: Test on latest Ruby versions available
Merge pull request #77 from dlackty/patch-1

Add missing JSON formatter to README
Fixing documentation typo
Merge pull request #68 from iloveitaly/param-logging-docs

Adding documentation on how to enable param logging
Update changelog and add structure

  * renamed CHANGES.md to CHANGELOG.md
  * move changes from README.md to CHANGELOG.md
  * add structure that follows http://keepachangelog.com/
Add readability suggestions from Ben
Merge pull request #64 from mltsy/master

Add a note about logging request params manually?
remove unnecessary headings from changelog
Merge pull request #79 from pxlpnk/update_changelog

Update changelog and add structure
ship MIT license with the Gem
cleanup gemspec

this is based in the changes @grosser proposed
Merge pull request #80 from pxlpnk/add_license

Add license + cleanup gemspec