v5.0.3

• Merge pull request #46 from github/add-typescript-definition-file 2761989
• Merge branch 'master' into add-typescript-definition-file 59aae8d
• fix getter by changing it to be readonly 1a38ebd
• reference typescript definition file in package.json 788bbb9
• Remove polyfills and add unpkg endpoint 50780ff
• Update dependencies with npm audit fix 5d4610f
• add typescript definition file 2af22da
• make flow definition strict 35f33f0
• update lodash patch version 0b51da3

v5.0.2...v5.0.3