Adding dirtySinceLastSubmit on FieldRenderProps (#127)

Author: fliptaboada

src/index.d.ts

@@ -24,6 +24,7 @@ export interface FieldRenderProps {
     // TODO: Make a diff of `FieldState` without all the functions
     active: boolean
     dirty: boolean
+    dirtySinceLastSubmit: boolean
     error: any
     initial: boolean
     invalid: boolean

src/types.js.flow

@@ -25,6 +25,7 @@ export type FieldRenderProps = {
     // TODO: Make a diff of `FieldState` without all the functions
     active: boolean,
     dirty: boolean,
+    dirtySinceLastSubmit: boolean,
     error: any,
     initial: boolean,
     invalid: boolean,