fix *=- (close #35)

Test.hx

@@ -90,6 +90,7 @@ class Test {
 		test("var x=-3; x", -3);
 		test("var a:Array<Dynamic>=[1,2,4]; a[2]", 4, null, true);
 		test("/**/0", 0);
+		test("x=1;x*=-2", -2);
 		trace("Done");
 	}
 

hscript/Parser.hx

@@ -1063,14 +1063,16 @@ class Parser {
 			default:
 				if( ops[char] ) {
 					var op = String.fromCharCode(char);
+					var prev = -1;
 					while( true ) {
 						char = readChar();
-						if( !ops[char] ) {
+						if( !ops[char] || prev == '='.code ) {
 							if( op.charCodeAt(0) == '/'.code )
 								return tokenComment(op,char);
 							this.char = char;
 							return TOp(op);
 						}
+						prev = char;
 						op += String.fromCharCode(char);
 					}
 				}