* add support for setting the S3 endpoint url scheme via the `AWS_HTTPS` environment variables in `aws_get_object` function using boto3 (https://github.com/cogeotiff/rio-tiler/pull/476)
* Add semicolon `;` support for multi-blocks expression (https://github.com/cogeotiff/rio-tiler/pull/479)
* add `rio_tiler.expression.get_expression_blocks` method to split expression (https://github.com/cogeotiff/rio-tiler/pull/479)
* add `merged_statistics` method for `MultiBaseReader` to get statistics using between assets expression (https://github.com/cogeotiff/rio-tiler/pull/478)
**future deprecation**
* using a comma `,` in an expression to define multiple blocks will be replaced by semicolon `;`
python
before
expression = "b1+b2,b2"
new
expression = "b1+b2;b2"
**breaking changes**
* update morecantile requirement to `>=3.1,<4.0`. WebMercatorQuad TMS is now aligned with GDAL and Mercantile TMS definition.