deprecate iter methods

[ZoeyR]

No description provided.

[codecov]

Codecov Report

Merging #8 into v0.14 will increase coverage by 0.04%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##            v0.14    #8      +/-   ##
=======================================
+ Coverage   85.95%   86%   +0.04%     
=======================================
  Files          17    17              
  Lines         349   350       +1     
=======================================
+ Hits          300   301       +1     
  Misses         49    49

Impacted Files	Coverage Δ
dotenv/tests/test-dotenv-iter.rs	90% <ø> (ø)	⬆️
dotenv/tests/test-from-path-iter.rs	91.66% <ø> (ø)	⬆️
dotenv/tests/test-from-filename-iter.rs	90% <ø> (ø)	⬆️
dotenv/src/lib.rs	100% <100%> (ø)	⬆️

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