[misc] removing zip benchmark on travis, since doesn't really have me…

…aning, mysql comparison doesn't have compress option

.travis.yml

@@ -53,8 +53,6 @@ matrix:
       env: DB=mariadb:10.2 LINT=1
     - node_js: "node"
       env: DB=mariadb:10.2 BENCH=1
-    - node_js: "node"
-      env: DB=mariadb:10.2 BENCH=1 TEST_ZIP=1
     - node_js: "node"
       env: DB=mariadb:5.5
     - node_js: "node"

README.md

@@ -321,6 +321,8 @@ The pool reuses connection intensively, so this validation is done only if a con
 If no connection is available, the request for a connection will be put in a queue until connection timeout. 
 When a connection is available (new creation or released to the pool), it will be use to satisfy queued requests in FIFO order.
 
+When a connection is given back to pool, any remaining transaction will be rollback.
+
 #### `pool.getConnection() → Promise`
 
 >

benchmarks/common_benchmarks.js

@@ -197,7 +197,7 @@ function Bench() {
 
     // called between running benchmarks
     onCycle: function(event) {
-      pingAll(connList);
+      // pingAll(connList);
       //to avoid mysql2 taking all the server memory
       if (promiseMysql2 && promiseMysql2.clearParserCache) promiseMysql2.clearParserCache();
       if (mysql2 && mysql2.clearParserCache) mysql2.clearParserCache();