dev-python/grpclib: fixed missing copyright and metadata.xml

Signed-off-by: Antonín Říha <antonin.riha@protonmail.com>

dev-python/grpclib/grpclib-0.4.2.ebuild

@@ -1,3 +1,6 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
 EAPI=8
 
 DISTUTILS_USE_PEP517=setuptools

dev-python/grpclib/grpclib-0.4.3_rc2.ebuild

@@ -1,3 +1,6 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
 EAPI=8
 
 DISTUTILS_USE_PEP517=setuptools

dev-python/grpclib/metadata.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+  <maintainer type="person">
+    <email>antonin.riha@protonmail.com</email>
+    <name>Antonín Říha</name>
+  </maintainer>
+  <upstream>
+    <bugs-to>https://github.com/vmagamedov/grpclib/issues</bugs-to>
+    <remote-id type="pypi">grpclib</remote-id>
+    <remote-id type="github">vmagamedov/grpclib</remote-id>
+  </upstream>
+</pkgmetadata>