Fixed typo in README.markdown

Huh, how the hell did I not notice that before?
Redesign pfrequences for maximum performance according available processor cores by default.
lecture 10: fix typos
lecture 08: fix instance field access interop form
lecture 08: fix unordered list indentation
Fix some typos in lecture 10
Merge pull request #27 from IvayloDankolov/master

Fixed typo in README.markdown
Merge pull request #30 from tochev/lecture10_fixes

lecture 10: fix typos
Merge pull request #31 from gshopov/08-interop-forms-fix

08 interop forms fix
Merge branch '10-fix-typos' of https://github.com/mdimitrova/clojure-lectures into mdimitrova-10-fix-typos

Conflicts:
	lectures/10-reducers-lighttable.lecture
Merge pull request #29 from bobeff/lecture-10

Redesign pfrequences for maximum performance according available process...
lecture 10: improve examples