Make AnsiOutputStream#write synchronized to avoid possible problems

Author: gnodet

jansi/src/main/java/org/fusesource/jansi/AnsiOutputStream.java

@@ -72,9 +72,8 @@ public AnsiOutputStream(OutputStream os) {
     private static final int BEL = 7;
     private static final int SECOND_ST_CHAR = '\\';
 
-    // TODO: implement to get perf boost: public void write(byte[] b, int off, int len)
-
-    public void write(int data) throws IOException {
+    @Override
+    public synchronized void write(int data) throws IOException {
         switch (state) {
             case LOOKING_FOR_FIRST_ESC_CHAR:
                 if (data == FIRST_ESC_CHAR) {