Renaming conn to connection for consistency

src/client.js

@@ -30,15 +30,15 @@ class Client extends Api {
 	}
 
 	async withConnection( action ) {
-		let conn;
+		let connection;
 		const { pool } = this[ _state ];
 		try {
-			conn = await pool.acquire();
-			const result = await action( conn );
+			connection = await pool.acquire();
+			const result = await action( connection );
 			return result;
 		} finally {
-			if ( conn ) {
-				await pool.release( conn );
+			if ( connection ) {
+				await pool.release( connection );
 			}
 		}
 	}
@@ -56,7 +56,7 @@ class Client extends Api {
 		}
 		const { onBeginTransaction, onEndTransaction } = this[ _state ];
 
-		return this.withConnection( conn => Transaction.run( { conn, isolationLevel, action, context, onBeginTransaction, onEndTransaction } ) );
+		return this.withConnection( connection => Transaction.run( { connection, isolationLevel, action, context, onBeginTransaction, onEndTransaction } ) );
 	}
 
 	async dispose() {

src/transaction.js

@@ -10,22 +10,22 @@ class Transaction extends Api {
 		this.context = context;
 	}
 
-	static async run( { conn, isolationLevel, action, context, onBeginTransaction, onEndTransaction } ) {
-		const tx = new Transaction( conn, context );
+	static async run( { connection, isolationLevel, action, context, onBeginTransaction, onEndTransaction } ) {
+		const tx = new Transaction( connection, context );
 		try {
-			await conn.beginTransaction( "" /* name */, isolationLevel );
+			await connection.beginTransaction( "" /* name */, isolationLevel );
 			await onBeginTransaction( tx );
 			const result = await action( tx );
 			await onEndTransaction( tx );
-			await conn.commitTransaction();
+			await connection.commitTransaction();
 			return result;
 		} catch ( err ) {
 			// TODO: wrap err instead of mangling message
 			err.message = `Automatic Rollback. Failed Because: ${ err.message }`;
 			try {
-				await conn.rollbackTransaction();
+				await connection.rollbackTransaction();
 			} catch ( _ ) {
-				conn.close();
+				connection.close();
 			}
 			throw err;
 		}