docs: add release notes for 1.2.0

doc/source/release_notes/release-v1.2.0.rst

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+##################
+`Release v1.2.0`__
+##################
+
+- ``refactor``: single implicit import of pyTMD tools (`#130 <https://github.com/tsutterley/pyTMD/pull/130>`_)
+- ``refactor``: reorganization of tide model readers under ``io`` (`#132 <https://github.com/tsutterley/pyTMD/pull/132>`_)
+- ``refactor``: placed interpolation routines into new module (`#141 <https://github.com/tsutterley/pyTMD/pull/141>`_)
+- ``refactor``: move ``model`` class to ``io``
+- ``feat``: add constants class for ellipsoidal and gravitational parameters (`#135 <https://github.com/tsutterley/pyTMD/pull/135>`_)
+- ``feat``: functions to read and interpolate from all constituents (`#137 <https://github.com/tsutterley/pyTMD/pull/137>`_)
+- ``feat``: new functions to output ATLAS, FES and GOT netCDF4 files (`#139 <https://github.com/tsutterley/pyTMD/pull/139>`_)
+- ``feat``: output variables for some standard epochs used within tide programs
+- ``feat``: update forecast notebook with dynamic plotting
+- ``fix``: copy input coordinates so not adjusted within functions
+- ``docs``: update documentation for new structure
+- ``docs``: standardized citation format throughout docstrings
+- ``docs``: add release notes for all prior public releases
+- ``docs``: add new pyTMD logo
+- ``test``: read header from OPT test file and compare more variables
+- ``test``: add tests for ``io`` methods
+
+.. __: https://github.com/tsutterley/pyTMD/releases/tag/1.2.0