tidy up dependencies

package-lock.json

@@ -1,14 +1,9 @@
 {
   "name": "sapper",
-  "version": "0.0.9",
+  "version": "0.0.20",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "@std/esm": {
-      "version": "0.18.0",
-      "resolved": "https://registry.npmjs.org/@std/esm/-/esm-0.18.0.tgz",
-      "integrity": "sha512-oeHSSVp/WxC08ngpKgyYR4LcI0+EBwZiJcB58jvIqyJnOGxudSkxTgAQKsVfpNsMXfOoILgu9PWhuzIZ8GQEjw=="
-    },
     "acorn": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.2.1.tgz",
@@ -499,9 +494,9 @@
       }
     },
     "errno": {
-      "version": "0.1.5",
-      "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.5.tgz",
-      "integrity": "sha512-tv2H+e3KBnMmNRuoVG24uorOj3XfYo+/nJJd07PUISRr0kaMKQKL5kyD+6ANXk1ZIIsvbORsjvHnCfC4KIc7uQ==",
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.6.tgz",
+      "integrity": "sha512-IsORQDpaaSwcDP4ZZnHxgE85werpo34VYn1Ud3mq+eUsF593faR8oCZNXrROVkpFu2TsbrNhHin0aUrTsQ9vNw==",
       "requires": {
         "prr": "1.0.1"
       }
@@ -1879,7 +1874,7 @@
       "resolved": "https://registry.npmjs.org/memory-fs/-/memory-fs-0.4.1.tgz",
       "integrity": "sha1-OpoguEYlI+RHz7x+i7gO1me/xVI=",
       "requires": {
-        "errno": "0.1.5",
+        "errno": "0.1.6",
         "readable-stream": "2.3.3"
       }
     },
@@ -2559,12 +2554,6 @@
         "has-flag": "2.0.0"
       }
     },
-    "svelte": {
-      "version": "1.47.1",
-      "resolved": "https://registry.npmjs.org/svelte/-/svelte-1.47.1.tgz",
-      "integrity": "sha512-xRw4pjF19XKfeTxp+TOTE/MQmRS7tRzm0hhh0dr/nc3NuHBfCBXnfve0ZymF8tZ+J/WM0cqfZ83RxZid2zf7qA==",
-      "dev": true
-    },
     "tapable": {
       "version": "0.2.8",
       "resolved": "https://registry.npmjs.org/tapable/-/tapable-0.2.8.tgz",