fix protocol version compatibility on master

[diecui1202]

What is the purpose of the change

fix protocol version compatibility

Brief changelog

dubbo-common/.../Version.java

Verifying this change

XXXXX

Follow this checklist to help us incorporate your contribution quickly and easily:

• Make sure there is a GITHUB_issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Format the pull request title like [Dubbo-XXX] Fix UnknownException when host config not exist #XXX. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn clean install -DskipTests & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
• If this contribution is large, please follow the Software Donation Guide.

[codecov-io]

Codecov Report

Merging #2118 into master will increase coverage by 0.02%.
The diff coverage is 52.94%.

@@             Coverage Diff              @@
##             master    #2118      +/-   ##
============================================
+ Coverage      54.1%   54.13%   +0.02%     
- Complexity     5078     5080       +2     
============================================
  Files           559      559              
  Lines         24908    24922      +14     
  Branches       4438     4442       +4     
============================================
+ Hits          13477    13492      +15     
+ Misses         9395     9389       -6     
- Partials       2036     2041       +5

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/org/apache/dubbo/common/Version.java	48.23% <52.94%> (-1.07%)	15 <2> (+2)
...rpc/protocol/dubbo/telnet/InvokeTelnetHandler.java	51.89% <0%> (-3.8%)	11% <0%> (-2%)
...he/dubbo/remoting/transport/netty/NettyServer.java	67.85% <0%> (-3.58%)	8% <0%> (-1%)
...bo/remoting/transport/netty/NettyCodecAdapter.java	53.12% <0%> (-1.57%)	3% <0%> (ø)
.../java/org/apache/dubbo/config/ReferenceConfig.java	47.68% <0%> (+0.71%)	38% <0%> (ø)	⬇️
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	59.16% <0%> (+0.83%)	31% <0%> (+1%)	⬆️
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	78.67% <0%> (+1.47%)	29% <0%> (ø)	⬇️
...e/dubbo/remoting/transport/netty4/NettyServer.java	75.4% <0%> (+3.27%)	10% <0%> (+1%)	⬆️
.../dubbo/remoting/transport/netty4/NettyChannel.java	65% <0%> (+3.75%)	22% <0%> (+1%)	⬆️
...ubbo/rpc/protocol/dubbo/ChannelWrappedInvoker.java	41.66% <0%> (+4.16%)	3% <0%> (ø)	⬇️
... and 1 more

---

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 2ec30bf...f3e817d. Read the comment docs.

[diecui1202]

#2104