solo3.3 升级到 solo3.4 报如下错误：
[ERROR]-[2019-03-24 21:23:11]-[org.b3log.solo.service.UpgradeService:84]: Upgrade failed, please contact the Solo developers or reports this issue: https://github.com/b3log/solo/issues/new
org.json.JSONException: JSONObject["version"] not a string.
at org.json.JSONObject.getString(JSONObject.java:833)
at org.b3log.solo.service.UpgradeService.upgrade(UpgradeService.java:63)
at org.b3log.solo.service.UpgradeService_KaTeX parse error: Expected group after '_' at position 38: …(UpgradeService_̲jvst213_10.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.b3log.latke.ioc.JavassistMethodHandler.invoke(JavassistMethodHandler.java:116)
at org.b3log.solo.service.UpgradeServiceKaTeX parse error: Expected group after '_' at position 35: …(UpgradeService_̲_jvst213_10.java)
at org.b3log.solo.SoloServletListener.contextInitialized(SoloServletListener.java:100)
at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:952)
at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:558)
at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:917)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:370)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:847)
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:287)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
at org.eclipse.jetty.server.Server.start(Server.java:416)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:108)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.server.Server.doStart(Server.java:383)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.b3log.solo.Starter.main(Starter.java:178)
大致意思是版本号应该是一个 String，我这该在哪里更改呢？
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