Docs: Add ShaderMaterial.uniformsNeedUpdate.

docs/api/en/materials/ShaderMaterial.html

@@ -409,6 +409,11 @@ this.extensions = {
 		so updating the value of the uniform will immediately update the value available to the GLSL code.
 		</p>
 
+		<h3>[property:Boolean uniformsNeedUpdate]</h3>
+		<p>
+		Can be used to force a uniform update while changing uniforms in [page:Object3D.onBeforeRender](). Default is *false*.
+		</p>
+
 		<h3>[property:Boolean vertexColors]</h3>
 		<p>
 		Defines whether vertex coloring is used. Default is *false*.

docs/api/zh/materials/ShaderMaterial.html

@@ -357,6 +357,11 @@ this.extensions = {
 			注意，uniforms逐帧被刷新，所以更新uniform值将立即更新GLSL代码中的相应值。
 		</p>
 
+		<h3>[property:Boolean uniformsNeedUpdate]</h3>
+		<p>
+		Can be used to force a uniform update while changing uniforms in [page:Object3D.onBeforeRender](). Default is *false*.
+		</p>
+
 		<h3>[property:Boolean vertexColors]</h3>
 		<p>
 		Defines whether vertex coloring is used. Default is *false*.