fix: update three examples imports (#73)

Some bundlers like Angular bundler complains about three/examples/jsm
imports without `.js` ending.

Author: nartc

src/core/Caustics.ts

@@ -1,6 +1,6 @@
 import * as THREE from 'three'
 import { shaderMaterial } from './shaderMaterial'
-import { FullScreenQuad } from 'three/examples/jsm/postprocessing/Pass'
+import { FullScreenQuad } from 'three/examples/jsm/postprocessing/Pass.js'
 import { useFBO } from './useFBO'
 import { PlaneGeometry } from 'three'
 

src/core/Outlines.ts

@@ -1,6 +1,6 @@
 import { shaderMaterial } from './shaderMaterial'
 import * as THREE from 'three'
-import { toCreasedNormals } from 'three/examples/jsm/utils/BufferGeometryUtils'
+import { toCreasedNormals } from 'three/examples/jsm/utils/BufferGeometryUtils.js'
 
 export type OutlinesProps = {
   /** Outline color, default: black */