Update README.md

Spelling fix.
Merge pull request #6 from kitofr/master

Update README.md
fix test
Merge pull request #125 from siscia/fix#111

Fix#111
Merge branch 'master' of github.com:seancorfield/clj-time
Merge pull request #126 from seancorfield/master

Typo in README that was PR'd against my fork instead of clj-time
Add a yesterday function to core
Merge pull request #127 from pastafari/add-yesterday

Add a yesterday function to core
Implemented midje-readme
Merge pull request #136 from boxed/master

Implemented midje-readme
Test against 1.4+ on Travis
Cosmetics
Ignore nREPL artifacts
More correct clj-time.period/periodic-seq implementation

References #130, #137.
Fixes #74
0.8.0

Fixes #138.
Back to development version
0.8.0 is out
Ditto
README updates