feat: add boolean type support (fixes #6)

Author: gajus

src/utilities/mapFlowType.js

@@ -15,6 +15,10 @@ export default (databaseTypeName: string): string => {
     return 'string';
   }
 
+  if (databaseTypeName === 'boolean') {
+    return 'boolean';
+  }
+
   if (databaseTypeName === 'bigint' || databaseTypeName === 'integer') {
     return 'number';
   }

test/utilities/mapFlowTypes.js

@@ -5,6 +5,7 @@ import mapFlowType from '../../src/utilities/mapFlowType';
 
 const knownTypes = {
   bigint: 'number',
+  boolean: 'boolean',
   character: 'string',
   coordinates: 'string',
   integer: 'number',