dbl: remove MSRV policy section from readme

Author: newpavlov

dbl/README.md

@@ -11,14 +11,6 @@ Double operation (a.k.a. "multiply-by-x") in Galois Field `GF(2^n)` using
 the lexicographically first polynomial among the irreducible degree `n` polynomials
 having a minimum number of coefficients.
 
-## Minimum Supported Rust Version (MSRV) Policy
-
-MSRV increases are not considered breaking changes and can happen in patch
-releases.
-
-The crate MSRV accounts for all supported targets and crate feature
-combinations, excluding explicitly unstable features.
-
 ## License
 
 Licensed under either of: