Update doc

doc.md

@@ -64,6 +64,7 @@
 #####[SetHandle](#SetHandle)
 #####[GetHandle](#GetHandle)
 #####[GetTitle](#GetTitle)
+#####[GetPID](#GetPID)
 
 ###<h3 id="GetVersion">.GetVersion()</h3>
     get robotgo version
@@ -525,5 +526,15 @@ func main() {
            
 
 ####Return:
-    Returns Window Title           
+    Returns Window Title      
+
+###<h3 id="GetPID">.GetPID()</h3>
+
+   Get the process id
+
+####Arguments:
+           
+
+####Return:
+    Returns the process id         
      

doc_zh.md

@@ -67,6 +67,7 @@
 #####[SetHandle](#SetHandle)
 #####[GetHandle](#GetHandle)
 #####[GetTitle](#GetTitle)
+#####[GetPID](#GetPID)
 
 
 ##<h2 id="Keyboard">键盘</h2>
@@ -540,4 +541,14 @@ func main() {
            
 
 ####返回值:
-    返回窗口标题     
+    返回窗口标题  
+
+###<h3 id="GetPID">.GetPID()</h3>
+
+   获取进程id
+
+####参数:
+           
+
+####返回值:
+    返回进程id        

robotgo.go

@@ -39,7 +39,7 @@ import (
 )
 
 const (
-	version string = "v0.42.0.219,Mount Ngauruhoe!"
+	version string = "v0.42.0.221,Mount Ngauruhoe!"
 )
 
 //GetVersion get version