remove 'core' as it matches a package directory

scripts/migration_script.sh

diff --git a/scripts/migration_script.sh b/scripts/migration_script.sh
index 3a8ffb6..7fcc88b 100644
--- a/scripts/migration_script.sh
+++ b/scripts/migration_script.sh
@@ -330,7 +330,6 @@
 *~
 *.rej
 *.bak
-core
 *.patch
 javacore.*
 heapdump.*
@@ -644,7 +643,6 @@
 *~
 *.rej
 *.bak
-core
 *.patch
 javacore.*
 heapdump.*
@@ -897,7 +895,6 @@
 *~
 *.rej
 *.bak
-core
 *.patch
 javacore.*
 heapdump.*
@@ -1061,7 +1058,6 @@
 *~
 *.rej
 *.bak
-core
 *.patch
 javacore.*
 heapdump.*