fix: fix new flow errors in flow .78 (#29)

Author: satya164

src/createWithTheme.js

@@ -13,7 +13,7 @@ import type { ThemeProviderType } from './createThemeProvider';
 const isClassComponent = (Component: any) =>
   Boolean(Component.prototype && Component.prototype.isReactComponent);
 
-export type WithThemeType<T, S> = <C: React.ComponentType<*>>(
+export type WithThemeType<T, S> = <P, C: React.ComponentType<P>>(
   Comp: C
 ) => C &
   React.ComponentType<

src/utils.js

@@ -31,6 +31,7 @@ export function copyRefs<Props>(
   TargetComponent: React.ComponentType<Props>,
   SourceComponent: React.ComponentType<Props>
 ): React.ComponentType<Props> {
+  // $FlowFixMe
   if (!SourceComponent.prototype) {
     return TargetComponent;
   }