Destroying knex when done to ensure process exit.

package-lock.json

@@ -4168,11 +4168,6 @@
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@@ -5407,11 +5402,6 @@
         "tweetnacl": "~0.14.0"
       }
     },
-    "stackback": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
-      "integrity": "sha1-Gsig2Ug4SNFpXkGLbQMaPDzmjjs="
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       "resolved": "https://registry.npmjs.org/static-extend/-/static-extend-0.1.2.tgz",
@@ -6046,14 +6036,6 @@
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
     },
-    "why-is-node-running": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.1.0.tgz",
-      "integrity": "sha512-oLmJ1uZOaKra+GDmYcUHMnVhi4CnZnlt4IE3J05ZDSEAiejeB5dMoR4a4rGcMWRy1Avx24dGTw8yxJ/+EmwPBQ==",
-      "requires": {
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-      }
-    },
     "wide-align": {
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       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",