Added changelog

CHANGELOG.md

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+# Changelog
+
+## Release 3.1.0
+
+- Added support for TD-DMRG with time-independent Hamiltonian
+
+## Release 3.0.6
+
+- Bugfix for compilation with BUILD_PREBO=OFF
+
+## Release 3.0.5
+
+- Added support for PreBO DMRG calculations
+
+## Release 3.0.4
+
+- Fixed overlap calculations in MPSSI
+- Fixed number of sweeps for DMRGSCF excited states
+- Got rid of boost::enable_if and boost::shared_ptr in favour of STL
+- Small updates in the Fortran interface and for Mac OS X
+
+## Release 3.0.3
+
+- Fix for Fiedler ordering and excited states
+- Faster parallel RDM evaluation
+- Fixed some crashes for TDM evaluation
+- Added several tests for RDMs
+- Ability to read necessary parameters from checkpoint files