Fix tableName assertion to allow uppercase

src/introspect.js

@@ -8,7 +8,7 @@ module.exports = async function knexIntrospect(knex, tableName) {
 	let clientType = knex.client.config.client;
 	assert(clientType === "sqlite3" || clientType === "pg");
 
-	assert(/^[a-zA_Z_]+$/.test(tableName));
+	assert(/^[a-zA-Z_]+$/.test(tableName));
 	let safeTableName = tableName; // FIXME: Sanitize instead of assert?
 	let tableLayout = {};