Spec2nexus

* `221 <https://github.com/prjemian/spec2nexus/issues/221>`_
move CI from travis-ci to Github Actions, test with python 3.8
* `217 <https://github.com/prjemian/spec2nexus/issues/217>`_
raise ValueError when ``L`` and ``N`` lines do not agree

.. note:: Python 2 end of support

spec2nexus stopped development for Python 2 after release *2021.1.7*, *2019-11-21*.
For more information, visit https://python3statement.org/.

Note: Last version with support for Python 2

* `213 <https://github.com/prjemian/spec2nexus/issues/213>`_
copy data file to gallery

* `208 <https://github.com/prjemian/spec2nexus/issues/208>`_
add more diagnostics to gallery web page comments

* `191 <https://github.com/prjemian/spec2nexus/issues/191>`_
write each positioner to NXpositioner group

* `188 <https://github.com/prjemian/spec2nexus/issues/188>`_
catenate continued lines before parsing data

* `186 <https://github.com/prjemian/spec2nexus/issues/186>`_
remove unused code

* `210 <https://github.com/prjemian/spec2nexus/issues/210>`_
add `-c prjemian` conda channel

* `209 <https://github.com/prjemian/spec2nexus/issues/209>`_
*pyRestTable* added to installation requirements

* `206 <https://github.com/prjemian/spec2nexus/issues/206>`_
specplot_gallery: replot shows all existing plots

* `202 <https://github.com/prjemian/spec2nexus/issues/202>`_
specplot_gallery: switch to SVG (from PNG) for plots
* `201 <https://github.com/prjemian/spec2nexus/issues/201>`_
spec: subsequent calls to read() duplicate scans -- FIXED
* `126 <https://github.com/prjemian/spec2nexus/issues/126>`_
spec: new ``update_available`` property
* `108 <https://github.com/prjemian/spec2nexus/issues/108>`_
specplot_gallery: only update plots with *new* content