diff --git a/package-lock.json b/package-lock.json
index f3e2fe7..c9f4a0a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -971,6 +971,7 @@
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       "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-glob": "2.0.1"
       }
@@ -1045,7 +1046,8 @@
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       "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-1.1.6.tgz",
       "integrity": "sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-dotfile": {
       "version": "1.0.3",
@@ -1075,7 +1077,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
       "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-finite": {
       "version": "1.0.2",
@@ -1091,6 +1094,7 @@
       "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-2.0.1.tgz",
       "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-extglob": "1.0.0"
       }
@@ -1123,7 +1127,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
       "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "isobject": {
       "version": "2.1.0",
@@ -1158,6 +1163,7 @@
       "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
       "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-buffer": "1.1.6"
       }
@@ -1224,7 +1230,7 @@
     "mkdirp": {
       "version": "0.5.1",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
-      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
+      "integrity": "sha512-SknJC52obPfGQPnjIkXbmA6+5H15E+fR+E4iR2oQ3zzCLbd7/ONua69R/Gw7AgkTLsRG+r5fzksYwWe1AgTyWA==",
       "dev": true,
       "requires": {
         "minimist": "0.0.8"
@@ -1241,6 +1247,7 @@
       "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
       "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
       "dev": true,
+      "optional": true,
       "requires": {
         "remove-trailing-separator": "1.1.0"
       }
@@ -1467,13 +1474,15 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
       "integrity": "sha1-wkvOKig62tW8P1jg1IJJuSN52O8=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "repeat-element": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/repeat-element/-/repeat-element-1.1.2.tgz",
       "integrity": "sha1-7wiaF40Ug7quTZPrmLT55OEdmQo=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "repeat-string": {
       "version": "1.6.1",
@@ -1495,7 +1504,8 @@
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
       "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "semver": {
       "version": "5.5.0",