use compression middleware

package-lock.json

@@ -1636,6 +1636,35 @@
       "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=",
       "dev": true
     },
+    "compressible": {
+      "version": "2.0.14",
+      "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.14.tgz",
+      "integrity": "sha1-MmxfUH+7BV9UEWeCuWmoG2einac=",
+      "requires": {
+        "mime-db": ">= 1.34.0 < 2"
+      },
+      "dependencies": {
+        "mime-db": {
+          "version": "1.34.0",
+          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.34.0.tgz",
+          "integrity": "sha1-RS0Oz/XDA0am3B5kseruDTcZ/5o="
+        }
+      }
+    },
+    "compression": {
+      "version": "1.7.2",
+      "resolved": "http://registry.npmjs.org/compression/-/compression-1.7.2.tgz",
+      "integrity": "sha1-qv+81qr4VLROuygDU9WtFlH1mmk=",
+      "requires": {
+        "accepts": "~1.3.4",
+        "bytes": "3.0.0",
+        "compressible": "~2.0.13",
+        "debug": "2.6.9",
+        "on-headers": "~1.0.1",
+        "safe-buffer": "5.1.1",
+        "vary": "~1.1.2"
+      }
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",