WebGLRenderer: Set debug.checkShaderErrors to true.

src/renderers/WebGLRenderer.js

@@ -84,7 +84,7 @@ function WebGLRenderer( parameters ) {
 		 * Enables error checking and reporting when shader programs are being compiled
 		 * @type {boolean}
 		 */
-		checkShaderErrors: false
+		checkShaderErrors: true
 	};
 
 	// clearing