* Updates to support Rails 5, Rack 3 and Sinatra 2 (beta).
- Bump upper boundary of version for Rack dependency from 2.0 to 3 (exclusive).
- Version bump sinatra for CI testing to >= 2.0.0.beta2.
- Also replaces use of String#hash in middleman-core/features/asset_host.feature
to ensure sufficiently random variables are returned.
Closesmiddleman/middleman#1983.
* Testing revert of the version requirements...
To confirm my changes don't cause a regression for any of:
- Rails < 5
- Sinatra < 2
- Rack < 2
* Revert "Testing revert of the version requirements..."
This reverts commit 5cf4c2a07c0814eefa573358b1bc9b0eeb62f9c1.
