Minor README.md improvements
Minor README.md improvements

yantrabuddhi/atomspace,AmeBel/atomspace,inflector/atomspace,inflector/atomspace,rTreutlein/atomspace,ArvinPan/atomspace,inflector/atomspace,AmeBel/atomspace,inflector/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,misgeatgit/atomspace,AmeBel/atomspace,rTreutlein/atomspace,AmeBel/atomspace,misgeatgit/atomspace,AmeBel/atomspace,yantrabuddhi/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,ArvinPan/atomspace,inflector/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace