Adding commas to authors array

Fixing formatting for the mcmod.info file. This fixes the warning message on server and client startup of:
[SEVERE] The mcmod.info file in ThaumcraftMobAspects.zip cannot be parsed as valid JSON. It will be ignored
argo.saj.InvalidSyntaxException: At line 11, column 5:  Expected either , or ] but got ["].
	at argo.saj.SajParser.arrayString(SajParser.java:92)
	at argo.saj.SajParser.aJsonValue(SajParser.java:198)
	at argo.saj.SajParser.aFieldToken(SajParser.java:137)
	at argo.saj.SajParser.objectString(SajParser.java:114)
	at argo.saj.SajParser.aJsonValue(SajParser.java:194)
	at argo.saj.SajParser.arrayString(SajParser.java:79)
	at argo.saj.SajParser.parse(SajParser.java:58)
	at argo.jdom.JdomParser.parse(JdomParser.java:36)
	at cpw.mods.fml.common.MetadataCollection.from(MetadataCollection.java:44)
	at cpw.mods.fml.common.discovery.JarDiscoverer.discover(JarDiscoverer.java:53)
	at cpw.mods.fml.common.discovery.ContainerType.findMods(ContainerType.java:42)
	at cpw.mods.fml.common.discovery.ModCandidate.explore(ModCandidate.java:71)
	at cpw.mods.fml.common.discovery.ModDiscoverer.identifyMods(ModDiscoverer.java:137)
	at cpw.mods.fml.common.Loader.identifyMods(Loader.java:353)
	at cpw.mods.fml.common.Loader.loadMods(Loader.java:484)
	at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99)
	at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:350)
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:92)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:630)
	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)