Update README to remove the whole SDK import.

[zoewangg]

Description

Update README to remove the whole SDK import section coz that's not encouraged. See #1258

License

• I confirm that this pull request can be released under the Apache 2 license

[codecov-io]

Codecov Report

Merging #1259 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1259      +/-   ##
============================================
+ Coverage     70.14%   70.18%   +0.04%     
  Complexity      188      188              
============================================
  Files           776      776              
  Lines         24122    24122              
  Branches       1799     1799              
============================================
+ Hits          16920    16930      +10     
+ Misses         6419     6408      -11     
- Partials        783      784       +1

Flag	Coverage Δ	Complexity Δ
#unittests	70.18% <ø> (+0.04%)	188 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
...o/netty/internal/http2/HttpOrHttp2ChannelPool.java	78.49% <0%> (-1.08%)	0% <0%> (ø)
...on/awssdk/services/kinesis/KinesisRetryPolicy.java	85.71% <0%> (ø)	0% <0%> (ø)	⬇️
...o/netty/internal/utils/BetterFixedChannelPool.java	60.22% <0%> (+6.07%)	0% <0%> (ø)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f1bd388...4920694. Read the comment docs.