Prepare changelog for 0.7.1 (#278)

* Prepare changelog for 0.7.1

* Update Changelog.md

Changelog.md

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+# 0.7.1 (2023-08-07)
+
+## What's Changed
+* Updates tests to Python 3.7/3.10, as 2.7/3.6 being EOL by @dbast in https://github.com/conda/conda-pack/pull/207
+* Renovations and require Python >=3.7 by @dbast in https://github.com/conda/conda-pack/pull/206
+* document packaging of environments as self-extracting executables by @saraedum in https://github.com/conda/conda-pack/pull/159
+* Add fix for core.py missing space by @Rtanti in https://github.com/conda/conda-pack/pull/218
+* Re-enable coverage reporting by @dbast in https://github.com/conda/conda-pack/pull/251
+* Allow the compression level to be set in zip files by @jjhelmus in https://github.com/conda/conda-pack/pull/252
+* Fix path separator on Windows distributions by @andysham in https://github.com/conda/conda-pack/pull/275
+* codesign binaries on osx-arm64 by @xhochy in https://github.com/conda/conda-pack/pull/257
+
+## New Contributors
+* @saraedum made their first contribution in https://github.com/conda/conda-pack/pull/159
+* @Rtanti made their first contribution in https://github.com/conda/conda-pack/pull/218
+* @kenodegard made their first contribution in https://github.com/conda/conda-pack/pull/227
+* @jezdez made their first contribution in https://github.com/conda/conda-pack/pull/233
+* @jjhelmus made their first contribution in https://github.com/conda/conda-pack/pull/252
+* @andysham made their first contribution in https://github.com/conda/conda-pack/pull/275