GetETag: don't ignore weakness indicator (#8)

* GetETag: don't use .let too much, add tests

* Added `weak` attribute

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Added tests for `weak` attribute

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Added tests for `weak` attribute

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Documented `eTag` and `weak`

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Refactor `weak` setting

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Using JUnit's `assertTrue`

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Use assertTrue / assertFalse

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>
Co-authored-by: Ricki Hirner <hirner@bitfire.at>

Update README

Improve XML signature detection (minor change); remove CHANGELOG

Fix Maven package building

Version bump to 2.1.2

Version bump to 2.1.1

Update Changelog

Use okhttp 4.5.0 (dav4jm master is now 2.x branch)

Ignore fragments when comparing URLs

Version 1.0

* first released version