Add "Thanks" section

And fix a small misspelling.
Let's go with one "l"
Fix license link in .nuspec
Add SmartThreadPool.dll to nuspec
Add SmartThreadPool.pdb and deliver with nupkg
Bump to 2.0.1
Merge pull request #25 from hudl/FixLicenseLinkInNuspec

Fix license link in .nuspec
Merge pull request #24 from hudl/AddSmartThreadPoolToNuspec

Add smart thread pool to nuspec
Merge pull request #23 from hudl/ReadmeThanks

Add "Thanks" section to the README
Merge pull request #26 from hudl/next

v2.0.1