Update cryptography requirement from ^2.6 to >=2.6,<4.0

Updates the requirements on [cryptography](https://github.com/pyca/cryptography) to permit the latest version.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pyca/cryptography/compare/2.6...3.0)

Signed-off-by: dependabot[bot] <support@github.com>

diff --git a/pyproject.toml b/pyproject.toml
index 059993f0ec69be4e5c54f08c0a97ff645e87a652..51d8b8e86a1c7dc8c13fd176f5ec96ec41925aef 100644 (file)
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ python = "^3.6"
 requests-toolbelt = {version="^0.9.1", optional=true}
 requests = {version="^2.23.0", optional=true}
 idna = {version="^2.1", optional=true}
-cryptography = {version="^2.6", optional=true}
+cryptography = {version=">=2.6,<4.0", optional=true}
 trio = {version=">=0.14,<0.17", optional=true}
 curio = {version="^1.2", optional=true}
 sniffio = {version="^1.1", optional=true}