Release 1.1.0 with upgrade of graphql-java to version 15

The version number doesn't really represent all the amazing work that @Andy2003 has put into the library since 1.0

This release which is also the new mainline contains the upgrade to graphql-java to version 15, that's why this is just the 1.x branch release to close it off. Thanks to @claymccoy for putting in all the work to make this possible.
So this should be more compatible with the base library and other projects that use version 15 of graphql-java.

Changes

• update graphql-java to version 15 #120
• Nested sorting on fields (#103) including multi-properties
• Add support for custom scalars (resolves #9) (#99)
• Add support for spatial point values and distance comparisons (#94) (resolves #11)

Bugfixes

• This bugfix solves a problem where inverse relationships were incorrectly mapped. (#123)
• Add missing test for rich relations where both ends are of same type (relates to #93) (#116)
• This change fixes an issue (#105) where properties got unset/overridden for when updating a node. (#117)
• Fix for relationship mutations are not using the correct direction (resolves #98) (#107)
• Fixes the issue that an update removes the custom ID field on the node (resolves #95) (#96)
• Fix for properties with underscores in sorting #115

Improvements for development/documentation

Improve test navigation (#114) - This change adds support for:

• nesting tests (deep hierarchy)
• direct navigation to failed block (cypher or cypher params)
• let augmentation-tests provides a diff on failure that can be viewed in IntelliJ