Upgrade canvas version to 2.4.1

package-lock.json

@@ -530,12 +530,13 @@
       "dev": true
     },
     "canvas": {
-      "version": "1.6.9",
-      "resolved": "https://registry.npmjs.org/canvas/-/canvas-1.6.9.tgz",
-      "integrity": "sha1-4/lc7HsWvy1vP8clwC2UDTJY9ps=",
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/canvas/-/canvas-2.4.1.tgz",
+      "integrity": "sha512-SaFomFqDuuuSTScTHQ7nXc5ea71Ieb8ctvwXjR7vzLsBMfp3euTv2xsTY70zIoC5r4sSQZYXv6tiHiORJ4y1vg==",
       "dev": true,
       "requires": {
-        "nan": "^2.4.0"
+        "nan": "^2.12.1",
+        "node-pre-gyp": "^0.11.0"
       }
     },
     "carto": {
@@ -1922,9 +1923,9 @@
       "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
     },
     "nan": {
-      "version": "2.11.1",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.11.1.tgz",
-      "integrity": "sha512-iji6k87OSXa0CcrLl9z+ZiYSuR2o+c0bGuNmXdrhTQTakxytAFsC56SArGYoiHlJlFoHSnvmhpceZJaXkVuOtA==",
+      "version": "2.13.2",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.13.2.tgz",
+      "integrity": "sha512-TghvYc72wlMGMVMluVo9WRJc0mB8KxxF/gZ4YYFy7V2ZQX9l7rgbPg7vjS9mt6U5HXODVFVI2bOduCzwOMv/lw==",
       "dev": true
     },
     "needle": {
@@ -1938,6 +1939,24 @@
         "sax": "^1.2.4"
       }
     },
+    "node-pre-gyp": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/node-pre-gyp/-/node-pre-gyp-0.11.0.tgz",
+      "integrity": "sha512-TwWAOZb0j7e9eGaf9esRx3ZcLaE5tQ2lvYy1pb5IAaG1a2e2Kv5Lms1Y4hpj+ciXJRofIxxlt5haeQ/2ANeE0Q==",
+      "dev": true,
+      "requires": {
+        "detect-libc": "^1.0.2",
+        "mkdirp": "^0.5.1",
+        "needle": "^2.2.1",
+        "nopt": "^4.0.1",
+        "npm-packlist": "^1.1.6",
+        "npmlog": "^4.0.2",
+        "rc": "^1.2.7",
+        "rimraf": "^2.6.1",
+        "semver": "^5.3.0",
+        "tar": "^4"
+      }
+    },
     "node-qunit-phantomjs": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/node-qunit-phantomjs/-/node-qunit-phantomjs-1.6.0.tgz",

package.json

@@ -33,7 +33,7 @@
   "devDependencies": {
     "@carto/mapnik": "^3.6.2-carto.11",
     "browserify": "^16.2.3",
-    "canvas": "^1.6.9",
+    "canvas": "^2.4.1",
     "leaflet": "1.0.3",
     "node-qunit-phantomjs": "1.6.0",
     "phantomjs-polyfill": "0.0.2",