add createContext to preact standalone bundle

fixes #145

Author: lmorchard

src/integrations/preact/standalone.mjs

@@ -11,7 +11,7 @@
  * limitations under the License.
  */
 
-import { h, Component, render as preactRender } from 'preact';
+import { h, Component, createContext, render as preactRender } from 'preact';
 import { useState, useReducer, useEffect, useLayoutEffect, useRef, useImperativeHandle, useMemo, useCallback, useContext, useDebugValue } from 'preact/hooks';
 import htm from '../../index.mjs';
 
@@ -21,4 +21,4 @@ function render(tree, parent) {
 
 const html = htm.bind(h);
 
-export { h, html, render, Component, useState, useReducer, useEffect, useLayoutEffect, useRef, useImperativeHandle, useMemo, useCallback, useContext, useDebugValue };
+export { h, html, render, Component, createContext, useState, useReducer, useEffect, useLayoutEffect, useRef, useImperativeHandle, useMemo, useCallback, useContext, useDebugValue };