diff --git a/lib/hsqldb_2.2.9.jar b/lib/hsqldb_2.2.9.jar
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--- a/lib/hsqldb_2.2.9.jar
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diff --git a/lib/javax.json.jar b/lib/javax.json.jar
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index a47350c..0000000
--- a/lib/javax.json.jar
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diff --git a/lib/postgresql-42.2.4.jar b/lib/postgresql-42.2.4.jar
deleted file mode 100644
index 4f747be..0000000
--- a/lib/postgresql-42.2.4.jar
+++ /dev/null
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