Change log for the coq-waterproof library

Version 2.1.1+8.17

Compatibility with earlier OCaml compilers
Fixes for the strong induction tactic

Version 2.1.0+8.17

Improve the Either tactic: now proves and destructs ordinary 'ors' when the goal is a proposition
Improve some mathematical definitions
Add vernacular for debugging automation

Version 2.0.2+8.17

Improve errors and warnings
Rework expanding definitions
Deal better with Rabs, Rmax, Rmin

Version 2.0.1+8.17

Build the plugin with dune

Version 2.0.0

Converted coq library to coq plugin
Automation procedures are now handled internally in the plugin, so that they can be customized and so that one can check the use of certain lemmas within the automation

Version 1.2.4

Added and updated theory files.
Improved notation for (in)equality chains, e.g. (& a < b <= c = d).
Bug fixes.

Version 1.1.2

Added and updated theory files.
Reorganized automation libraries.
Added goal wrappers that force user to write sentences that make proofscript more readable.
Support chains of (in)equalities for =, < and <= in naturals and reals.
Fixed issues with several tactics, including Take ....
Rephrased multiple tactics like Obtain ... according to ..., ....
For propositions, have user specify types rather than labels in tactics. Labeling is now optional.
Added some shielding for use of automation, e.g. statements starting with quantifiers cannot be proved automatically.

Version 1.0.0

Ported the original library written in ltac to Ltac2.