Serhii

Backward compatibility is broken, today "ajv-merge-patch" v5.0.1 is not working with "ajv"v6.12.3"

2

`node_modules/ajv/lib/keyword.js:30 throw new Error('Keyword ' + keyword + ' is not a valid identifier'); ^ ` It’s related witth [this](https://github.com/ajv-validator/ajv-merge-patch/compare/v4.1.0...v5.0.1#diff-4689f7c74e0e7d3a0fb49febf347c7c2d59dc2f83ef4b218dbc39e35785cc214) changes

HI! I would very thankful if you upgrade json-merge-patch from 0.2.3 to 1.0.2 in ajv-merge-patch 4.1.0 version. json-merge-patch has vulnerability and i haven’t ability upgrade ajv-merge-patch to 5.0.1 version. Explanation...