Update ReleaseNotes.md

Fixed typo
(#260) Correcing AppVeyor Support for Pull Requests

- As per discussion with @nulltoken, implemented a fix for AppVeyor where if the commit sha is not present of any detected local branches, check out a new branch using the sha as the pointer
(#260) Adding output for GenerateSetParameterMessage

- As per suggestion here:

https://github.com/Particular/GitVersion/issues/260#issuecomment-56985673
(#260) Favour local branches over remote ones

- Updated with suggestion from @nulltoken
- https://github.com/Particular/GitVersion/pull/262#discussion_r18103422
simplify MergeMessageParser
add concept of short version
fix merge message parser

fixes #259
Merge pull request #258 from henning-me/patch-1

Update ReleaseNotes.md
Merge pull request #262 from gep13/AppVeyorFixes

Correcting AppVeyor Support for Pull Requests
add semver tostring tests
move releasedate finding code
remove need to lookup sha
simplify ReleaseDateFinder
split out LastVersionOnMasterFinder
push sha and date up

so they are in the build metadata and not the release date
remove OriginalRelease

fixes #266
fixes #267
move cache to task

no need for in memory cache in an exe
use LastVersionOnMasterFinder in task
make LastVersionOnMasterFinder return a date
remove concept of releasedate from the core