bugfix issue #1036: supporting DROP SEQUENCE (#1037)

Author: mo3000

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -4466,6 +4466,8 @@ Drop Drop():
         tk=<K_VIEW>
         |
         tk=<K_SCHEMA>
+        |
+        tk=<K_SEQUENCE>
     )
     { drop.setType(tk.image); }
 

src/test/java/net/sf/jsqlparser/statement/drop/DropTest.java

@@ -89,4 +89,9 @@ public void testDropViewIssue545_2() throws JSQLParserException {
     public void testDropSchemaIssue855() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("DROP SCHEMA myschema");
     }
+
+    @Test
+    public void testDropSequence() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("DROP SEQUENCE mysequence");
+    }
 }