remove excess colon

src/math/Matrix3.js

@@ -203,7 +203,7 @@ Object.assign( Matrix3.prototype, {
 
 		if ( det === 0 ) {
 
-			var msg = "THREE.Matrix3: .getInverse(): can't invert matrix, determinant is 0";
+			var msg = "THREE.Matrix3: .getInverse() can't invert matrix, determinant is 0";
 
 			if ( throwOnDegenerate === true ) {
 

src/math/Matrix4.js

@@ -555,7 +555,7 @@ Object.assign( Matrix4.prototype, {
 
 		if ( det === 0 ) {
 
-			var msg = "THREE.Matrix4: .getInverse(): can't invert matrix, determinant is 0";
+			var msg = "THREE.Matrix4: .getInverse() can't invert matrix, determinant is 0";
 
 			if ( throwOnDegenerate === true ) {