Add initial version of CHANGELOG.md for v1.1.0

Author: spc93

CHANGELOG.md

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+# Changelog for version 1.1.0
+
+## Minor enhancements and bug-fixes.
+
+- http://purl.org/pan-science/PaNET/PaNET01146:
+  
+Change label to 'photoemission electron microscopy' for better consistency with community usage.
+  
+- http://purl.org/pan-science/PaNET/PaNET01107 (inelastic small angle scattering):
+
+Fix typo in label
+
+- http://purl.org/pan-science/PaNET/PaNET01125 (spectroscopy):
+
+Remove equivalence to 'versus energy' as this wrongly classifies MAD as spectroscopy.
+
+- http://purl.org/pan-science/PaNET/PaNET01124 (small angle scattering):
+
+No longer a subclass of 'diffraction' (which was an error).
+
+- Internal update: Add disjoint classes to Robot CSV file for easier implementation of disjoints.
+  
+- http://purl.org/pan-science/PaNET/PaNET01034 ('inelastic scattering') & http://purl.org/pan-science/PaNET/PaNET01020 ('elastic scattering')
+
+Now defined as being disjoint classes.