add "kubectl patch". It will replace "kubectl udpate --patch" in the future

contrib/completions/bash/kubectl

@@ -350,6 +350,27 @@ _kubectl_replace()
     must_have_one_noun=()
 }
 
+_kubectl_patch()
+{
+    last_command="kubectl_patch"
+    commands=()
+
+    flags=()
+    two_word_flags=()
+    flags_with_completion=()
+    flags_completion=()
+
+    flags+=("--help")
+    flags+=("-h")
+    flags+=("--patch=")
+    two_word_flags+=("-p")
+
+    must_have_one_flag=()
+    must_have_one_flag+=("--patch=")
+    must_have_one_flag+=("-p")
+    must_have_one_noun=()
+}
+
 _kubectl_delete()
 {
     last_command="kubectl_delete"
@@ -905,6 +926,7 @@ _kubectl()
     commands+=("describe")
     commands+=("create")
     commands+=("replace")
+    commands+=("patch")
     commands+=("delete")
     commands+=("namespace")
     commands+=("logs")