change antlr3 to antlr4 in readme file (#883)

* change antlr3 to antlr4 in readme and download.md
apache · Mar 5, 2020 · 0b5f27d · 0b5f27d
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diff --git a/README.md b/README.md
@@ -116,7 +116,7 @@ Under the root path of incubator-iotdb:
 
 Then the binary version (including both server and client) can be found at **distribution/target/apache-iotdb-{project.version}-incubating-bin.zip**
 
-> NOTE: Directories "service-rpc/target/generated-sources/thrift" and "server/target/generated-sources/antlr3" need to be added to sources roots to avoid compilation errors in the IDE.
+> NOTE: Directories "service-rpc/target/generated-sources/thrift" and "server/target/generated-sources/antlr4" need to be added to sources roots to avoid compilation errors in the IDE.
 
 ### Configurations
 

diff --git a/docs/Documentation/UserGuide/3-Server/1-Download.md b/docs/Documentation/UserGuide/3-Server/1-Download.md
@@ -60,7 +60,7 @@ Under the root path of incubator-iotdb:
 
 Then the binary version (including both server and client) can be found at **distribution/target/apache-iotdb-{project.version}-incubating-bin.zip**
 
-> NOTE: Directories "service-rpc/target/generated-sources/thrift" and "server/target/generated-sources/antlr3" need to be added to sources roots to avoid compilation errors in IDE.
+> NOTE: Directories "service-rpc/target/generated-sources/thrift" and "server/target/generated-sources/antlr4" need to be added to sources roots to avoid compilation errors in IDE.
 
 If you would like to build the IoTDB server, you can run the following command under the root path of incubator-iotdb: