core: Update README.rst
core: Update README.rst

So this isn't markdown but RST


Former-commit-id: cb9d5d2d89a1980d91d1a8a23ce14e85f391ab32 [formerly b352980b057213ee2b1ea8f16b3dacc9db02fbad]
Former-commit-id: 034ff27401b844efc4d8895c5043f173e42dea27
torhve/ivar2,torhve/ivar2,torhve/ivar2,haste/ivar2