Updates the requirements on [trio](https://github.com/python-trio/trio) to permit the latest version.
- [Release notes](https://github.com/python-trio/trio/releases)
- [Commits](https://github.com/python-trio/trio/compare/v0.14.0...v0.16.0)
Signed-off-by: dependabot[bot] <support@github.com>
requests = {version="^2.23.0", optional=true}
idna = {version="^2.1", optional=true}
cryptography = {version="^2.6", optional=true}
-trio = {version="^0.14", optional=true}
+trio = {version=">=0.14,<0.17", optional=true}
curio = {version="^1.2", optional=true}
sniffio = {version="^1.1", optional=true}