Bump serde_with version to 1.14.0

[jonasbb]

• Cleanup some doc links
• Bump some dev-dependencies

[codecov]

Codecov Report

Merging #463 (8773ac1) into master (d3140e1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #463   +/-   ##
=======================================
  Coverage   71.37%   71.37%           
=======================================
  Files          54       54           
  Lines        3717     3717           
=======================================
  Hits         2653     2653           
  Misses       1064     1064           

Impacted Files	Coverage Δ
serde_with/src/de/mod.rs	83.33% <ø> (ø)
serde_with/src/lib.rs	75.00% <ø> (ø)
serde_with/src/ser/mod.rs	60.00% <ø> (ø)
serde_with_macros/src/lib.rs	0.00% <ø> (ø)
serde_with/tests/serde_as/enum_map.rs	98.03% <100.00%> (ø)

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[jonasbb]

bors r+

[bors]

Build succeeded:

• Rustsec Audit
• Tests result