Add a changelog entry for the FE_PolyTensor mappings improvement

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+Improved: FE_PolyTensor now supports finite elements with different mapping 
+types for each shape function. The member variable mapping_type is now of 
+type std::vector<MappingType>. If the vector contains only one MappingType, 
+then the same mapping is applied to every shape function. If a list of 
+MappingTypes is provided, mapping_type[i] will be applied to shape function i.
+<br>
+(Graham Harper, 2019/07/12)