Starting to document releases

ReleaseHistory.md

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+# 0.3.6
+
+- Branchlengths in DLRS and DLTRS are now limited to 10. Sometimes, the MCMC strayed way passed that and later died because the appropriate substitution matrix could not be computed.
+- Fixed an unnoticed long-lasting bug: appending `fixed` to a rate parameter did not, in fact, fix that parameter, contrary to what the documentation said.
+
+# 0.3.5a to 0.3.5f
+
+Bug fixes.
+
+# Prior to 0.3.5
+
+There are rumours that there were version released here, but this is all unconfirmed. ;-)