Fix typo in heka.toml
diff --git a/apache/files/heka.toml b/apache/files/heka.toml
index c03fe17..c4956e2 100644
--- a/apache/files/heka.toml
+++ b/apache/files/heka.toml
@@ -51,7 +51,7 @@
 user_agent_transform = true
 log_format = '%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"'
 
-Sandbox_apache_error]
+[Sandbox_apache_error]
 type = "SandboxDecoder"
 filename = "lua_decoders/decoders/apache-error.lua"