Combined all changelog files into CHANGELOG.md

CHANGELOG.md

@@ -1,4 +1,13 @@
 # Changelog
+## 1.26.0
+* Log file path (can be set by the `--log-file-path` flag or the `DEMISTO_SDK_LOG_FILE_PATH` environment variable) can now only accept directory values. Setting it to a file path is no longer supported (file name is now constantly `demisto_sdk_debug.log` and cannot be changed). The path will now be automatically generated if it doesn't exist. [#3912](https://github.com/demisto/demisto-sdk/pull/3912)
+* Log files will now be saved by default to `$HOME/.demisto-sdk/logs`. This behavior can be overridden by the `--log-file-path` flag, or the `DEMISTO_SDK_LOG_FILE_PATH` environment variable. [#3912](https://github.com/demisto/demisto-sdk/pull/3912)
+* Added warning when running on Windows (not supported) [#3950](https://github.com/demisto/demisto-sdk/pull/3950)
+* Fixed an issue where the ***validate*** command failed on pre-processing rules. [#3977](https://github.com/demisto/demisto-sdk/pull/3977)
+* Fixed an issue in **upload** where customFields with explicitly defined values (e.g., ${}) caused the command to fail. [#3970](https://github.com/demisto/demisto-sdk/pull/3970)
+* Fixed an issue where validate command failed with Lists folder containing a data json file. [#3971](https://github.com/demisto/demisto-sdk/pull/3971)
+* Added graph capabilities in **TestSuite**. [#3932](https://github.com/demisto/demisto-sdk/pull/3932)
+
 ## 1.25.3
 * Fixed false positives in **validate** in `GR103` validations [#3873](https://github.com/demisto/demisto-sdk/pull/3873)
 * Add command `sdk-changelog` for creating a yml file to describe the development changes in the SDK [#3177](https://github.com/demisto/demisto-sdk/pull/3177)