Make WebGLAttributes.d.ts strict

src/renderers/webgl/WebGLAttributes.d.ts

+import { BufferAttribute } from "../../core/BufferAttribute";
+import { InterleavedBufferAttribute } from "../../core/InterleavedBufferAttribute";
+
 export class WebGLAttributes {
 
 	constructor( gl: WebGLRenderingContext | WebGL2RenderingContext );
 
-	get( attribute: any ): any;
+	get( attribute: BufferAttribute | InterleavedBufferAttribute ): {
+		buffer: WebGLBuffer,
+		type: GLenum,
+		bytesPerElement: number,
+		version: number
+	};
 
-	remove( attribute: any ): void;
+	remove( attribute: BufferAttribute | InterleavedBufferAttribute ): void;
 
-	update( attribute: any, bufferType: Array<any> ): void;
+	update( attribute: BufferAttribute | InterleavedBufferAttribute, bufferType: GLenum ): void;
 
 }