Minor fixes to README.txt.
Minor fixes to README.txt.

lspector/Clojush,saulshanabrook/Clojush,Vaguery/Clojush,thelmuth/Clojush,Vaguery/Clojush,NicMcPhee/Clojush,NicMcPhee/Clojush,lspector/Clojush,saulshanabrook/Clojush,thelmuth/Clojush