ecdsa: MSRV 1.52

[tarcieri]

Introduced in RustCrypto/traits#739

[codecov-commenter]

Codecov Report

Merging #359 (e700211) into master (e795f91) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #359   +/-   ##
=======================================
  Coverage   53.65%   53.65%           
=======================================
  Files           9        9           
  Lines         328      328           
=======================================
  Hits          176      176           
  Misses        152      152           

Impacted Files	Coverage Δ
ecdsa/src/lib.rs	37.50% <ø> (ø)

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