用mvn编译的时候报错了，报错是什么：

[ERROR] 不再支持源选项 1.5。请使用 1.6 或更高版本。

[ERROR] 不再支持目标选项 1.5。请使用 1.6 或更高版本。

完整的报错在下面。

[INFO] Scanning for projects...

[INFO] 

[INFO] --------------------< com.imooc.hadoop:trainhadoop >--------------------

[INFO] Building trainhadoop 1.0

[INFO] --------------------------------[ jar ]---------------------------------

[INFO] 

[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ trainhadoop ---

[INFO] Deleting /Users/liuchenyang/Documents/hadoop_project/trainhadoop/target

[INFO] 

[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ trainhadoop ---

[INFO] Using 'UTF-8' encoding to copy filtered resources.

[INFO] skip non existing resourceDirectory /Users/liuchenyang/Documents/hadoop_project/trainhadoop/src/main/resources

[INFO] 

[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ trainhadoop ---

[INFO] Changes detected - recompiling the module!

[INFO] Compiling 1 source file to /Users/liuchenyang/Documents/hadoop_project/trainhadoop/target/classes

[INFO] -------------------------------------------------------------

[ERROR] COMPILATION ERROR : 

[INFO] -------------------------------------------------------------

[ERROR] 不再支持源选项 1.5。请使用 1.6 或更高版本。

[ERROR] 不再支持目标选项 1.5。请使用 1.6 或更高版本。

[INFO] 2 errors 

[INFO] -------------------------------------------------------------

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 1.728 s

[INFO] Finished at: 2018-03-15T20:35:17+08:00

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project trainhadoop: Compilation failure: Compilation failure: 

[ERROR] 不再支持源选项 1.5。请使用 1.6 或更高版本。

[ERROR] 不再支持目标选项 1.5。请使用 1.6 或更高版本。

[ERROR] -> [Help 1]

[ERROR] 

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR] 

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException