Update version number, add changelog (apache#1249)

Author: timsaucer

Cargo.lock

@@ -17,7 +17,7 @@
 
 [package]
 name = "datafusion-python"
-version = "49.0.0"
+version = "50.0.0"
 homepage = "https://datafusion.apache.org/python"
 repository = "https://github.com/apache/datafusion-python"
 authors = ["Apache DataFusion <dev@datafusion.apache.org>"]

Cargo.toml

@@ -0,0 +1,60 @@
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# Apache DataFusion Python 50.0.0 Changelog
+
+This release consists of 12 commits from 7 contributors. See credits at the end of this changelog for more information.
+
+**Implemented enhancements:**
+
+- feat: allow passing a slice to and expression with the [] indexing [#1215](https://github.com/apache/datafusion-python/pull/1215) (timsaucer)
+
+**Documentation updates:**
+
+- docs: fix CaseBuilder documentation example [#1225](https://github.com/apache/datafusion-python/pull/1225) (IndexSeek)
+- docs: update link to user example for custom table provider [#1224](https://github.com/apache/datafusion-python/pull/1224) (IndexSeek)
+- docs: add apache iceberg as datafusion data source [#1240](https://github.com/apache/datafusion-python/pull/1240) (kevinjqliu)
+
+**Other:**
+
+- 49.0.0 release [#1211](https://github.com/apache/datafusion-python/pull/1211) (timsaucer)
+- Update development guide in README.md [#1213](https://github.com/apache/datafusion-python/pull/1213) (YKoustubhRao)
+- Add benchmark script and documentation for maximizing CPU usage in DataFusion Python [#1216](https://github.com/apache/datafusion-python/pull/1216) (kosiew)
+- Fixing a few Typos [#1220](https://github.com/apache/datafusion-python/pull/1220) (ntjohnson1)
+- Set fail on warning for documentation generation [#1218](https://github.com/apache/datafusion-python/pull/1218) (timsaucer)
+- chore: remove redundant error transformation [#1232](https://github.com/apache/datafusion-python/pull/1232) (mesejo)
+- Support string column identifiers for sort/aggregate/window and stricter Expr validation [#1221](https://github.com/apache/datafusion-python/pull/1221) (kosiew)
+- Prepare for DF50 [#1231](https://github.com/apache/datafusion-python/pull/1231) (timsaucer)
+
+## Credits
+
+Thank you to everyone who contributed to this release. Here is a breakdown of commits (PRs merged) per contributor.
+
+```
+     4	Tim Saucer
+     2	Tyler White
+     2	kosiew
+     1	Daniel Mesejo
+     1	Kevin Liu
+     1	Koustubh Rao
+     1	Nick
+```
+
+Thank you also to everyone who contributed in other ways such as filing issues, reviewing PRs, and providing feedback on this release.
+