add DPLPMTUD (RFC 8899) to list of supported RFCs in README

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Base: 85.81% // Head: 85.60% // Decreases project coverage by -0.21% ⚠️

Coverage data is based on head (411579c) compared to base (a901357).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3520      +/-   ##
==========================================
- Coverage   85.81%   85.60%   -0.21%     
==========================================
  Files         134      137       +3     
  Lines        9851    10008     +157     
==========================================
+ Hits         8453     8567     +114     
- Misses       1027     1064      +37     
- Partials      371      377       +6     

Impacted Files	Coverage Δ
sys_conn_df_linux.go	52.94% <0.00%> (ø)
internal/qtls/go118.go	58.33% <0.00%> (ø)
sys_conn_oob.go	71.88% <0.00%> (ø)
packet_handler_map.go	72.37% <0.00%> (+0.78%)	⬆️
http3/server.go	74.29% <0.00%> (+1.25%)	⬆️

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