Update default maxChars in createTextstringDataType (#328)

Change default maxChars value from 0 to 50 in  createTextstringDataType method.

Author: AndyButland

lib/helpers/DataTypeApiHelper.ts

@@ -1081,7 +1081,7 @@ export class DataTypeApiHelper {
     return await this.save(dataType);
   }
 
-  async createTextstringDataType(name: string, maxChars: number = 0) {
+  async createTextstringDataType(name: string, maxChars: number = 50) {
     await this.ensureNameNotExists(name);
 
     const dataType = new TextStringDataTypeBuilder()
@@ -1964,4 +1964,4 @@ export class DataTypeApiHelper {
 
     return await this.save(dataType);
   }
-}
+}