Remove disclaimer (#42)

 remote DISCLAIMER
diff --git a/DISCLAIMER b/DISCLAIMER
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-Apache Doris is an effort undergoing incubation at The
-Apache Software Foundation (ASF), sponsored by the Apache Incubator PMC.
-
-Incubation is required of all newly accepted
-projects until a further review indicates that the
-infrastructure, communications, and decision making process have
-stabilized in a manner consistent with other successful ASF
-projects.
-
-While incubation status is not necessarily a reflection
-of the completeness or stability of the code, it does indicate
-that the project has yet to be fully endorsed by the ASF.