Remove obsolete timestamp overrides

Author: ctrueden

timestamps.txt

@@ -39,7 +39,6 @@ net.java.dev.jna:jna 20181208000000
 org.apache.poi:poi 20181208000000
 org.apache.spark:spark-core_2.11 20181231000000
 org.janelia:H5J_Loader_Plugin 20180929000000
-org.javassist:javassist 20181026000000
 org.jetbrains.kotlin:kotlin-reflect 20181231000000
 org.jetbrains.kotlin:kotlin-stdlib-jdk8 20181231000000
 org.jmockit:jmockit 20190101120000