v3.0.4

• Merge pull request #20 from github/add-typescript-definition-file 173b0f7
• loaded is not a nullable field c676605
• use union type for nullable types 45d293e
• Merge branch 'master' into add-typescript-definition-file ee39326
• add typescript definition file 0b79c40

v3.0.3...v3.0.4