Added SubmissionError into export for immutabable

Added SubmissionError into export in redux-from/immutable/index.d.ts
in order to be able to use SubmissionError with immutable store state.

In redux-form/lib/SubmissionError.d.ts changed default generic from void
to any, in order to be able to use it as is state redux-form docs.

http://redux-form.com/7.0.3/examples/submitValidation/

Because there is no way to pass anoter type into generic constructor
from real project.

types/redux-form/immutable/index.d.ts

@@ -20,4 +20,5 @@ export {
     isPristine,
     isSubmitting,
     isValid,
+    SubmissionError
 } from "redux-form";

types/redux-form/lib/SubmissionError.d.ts

@@ -1,7 +1,7 @@
 import { FormErrors } from "redux-form";
 
-export interface SubmissionErrorConstructor<T = void> {
+export interface SubmissionErrorConstructor<T> {
     new (errors?: FormErrors<T>): Error;
 }
 
-declare const SubmissionError: SubmissionErrorConstructor;
+declare const SubmissionError: SubmissionErrorConstructor<any>;