Updated license information for the marker-clustering example.

Author: SebQuintas-zz

marker-clustering/LICENSE

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+ODC Database Contents License (DbCL) v1.0
+
+The Licensor and You agree as follows:
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+The definitions of the Open Database License (ODbL) 1.0 are incorporated
+by reference into the Database Contents License.
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+2.2 Conditions of Use. You must comply with the ODbL.
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