Release 4 new icons and 10 updated icons (v3.1.0)

# New Icons

- Drooble (#3231)
- IFTTT (#3304)
- JPEG (#3303)
- Planet (#3274)

# Updated Icons

- Ardour (#3256)
- Basecamp (#3277)
- Celery (#3256)
- CentOS (#3256)
- Cloudsmith (#3256)
- deepin (#3256)
- JetBrains (#3256)
- KTM (#3256)
- Nucleo (#3285)
- uBlock Origin (#3256)

.svglintrc.js

@@ -3,10 +3,11 @@ const { htmlFriendlyToTitle } = require("./scripts/utils.js");
 const getBounds = require("svg-path-bounding-box");
 
 const titleRegexp = /(.+) icon$/;
-const svgRegexp = /^<svg.*<\/svg>\r?\n?$/;
+const svgRegexp = /^<svg( [^\s]*=".*"){3}><title>.*<\/title><path d=".*"\/><\/svg>\r?\n?$/;
 
 const iconSize = 24;
 const iconFloatPrecision = 3;
+const iconTolerance = 0.001;
 const iconIgnored = require("./.svglint-ignored.json");
 
 module.exports = {
@@ -58,7 +59,7 @@ module.exports = {
             reporter.name = "icon-size";
 
             const iconPath = $.find("path").attr("d");
-            if (iconIgnored.hasOwnProperty(iconPath)) {
+            if (iconIgnored.size.hasOwnProperty(iconPath)) {
               return;
             }
 
@@ -77,9 +78,34 @@ module.exports = {
 
             const rawSVG = $.html();
             if (!svgRegexp.test(rawSVG)) {
-              reporter.error("Unexpected character(s) detected outside the opening and/or closing <svg> tags");
+              reporter.error("Unexpected character(s), most likely extraneous whitespace, detected in SVG markup");
             }
           },
+          function(reporter, $, ast) {
+            reporter.name = "icon-centered";
+            const iconPath = $.find("path").attr("d");
+            const bounds = getBounds(iconPath);
+
+            if (
+              iconIgnored.size.hasOwnProperty(iconPath) ||
+              iconIgnored.center.hasOwnProperty(iconPath)
+            ) {
+              return
+            }
+
+            const targetCenter = iconSize / 2;
+            const centerX = +((bounds.minX + bounds.maxX) / 2).toFixed(iconFloatPrecision);
+            const devianceX = centerX - targetCenter;
+            const centerY = +((bounds.minY + bounds.maxY) / 2).toFixed(iconFloatPrecision);
+            const devianceY = centerY - targetCenter;
+
+            if (
+              Math.abs(devianceX) > iconTolerance ||
+              Math.abs(devianceY) > iconTolerance
+            ) {
+              reporter.error(`<path> must be centered at (${targetCenter}, ${targetCenter}); the center is currently (${centerX}, ${centerY})`);
+            }
+          }
         ]
     }
 };

_data/simple-icons.json

@@ -737,7 +737,7 @@
         },
         {
             "title": "Basecamp",
-            "hex": "5ECC62",
+            "hex": "1D2D35",
             "source": "https://basecamp.com/about/press"
         },
         {
@@ -1665,6 +1665,11 @@
             "hex": "212121",
             "source": "https://github.com/drone/brand"
         },
+        {
+            "title": "Drooble",
+            "hex": "19C4BE",
+            "source": "https://blog.drooble.com/press/"
+        },
         {
             "title": "Dropbox",
             "hex": "0061FF",
@@ -2925,6 +2930,11 @@
             "hex": "EA1D2C",
             "source": "https://ifood.com.br/"
         },
+        {
+            "title": "IFTTT",
+            "hex": "000000",
+            "source": "https://ifttt.com/discover/brand-guidelines"
+        },
         {
             "title": "iHeartRadio",
             "hex": "C6002B",
@@ -3150,6 +3160,11 @@
             "hex": "5091CD",
             "source": "https://docs.joomla.org/Joomla:Brand_Identity_Elements"
         },
+        {
+            "title": "JPEG",
+            "hex": "8A8A8A",
+            "source": "https://jpeg.org/contact.html"
+        },
         {
             "title": "jQuery",
             "hex": "0769AD",
@@ -4192,8 +4207,8 @@
         },
         {
             "title": "Nucleo",
-            "hex": "766DCC",
-            "source": "https://nucleoapp.com/wp-content/themes/nucleo-webapp-12/img/logo.svg"
+            "hex": "111111",
+            "source": "https://nucleoapp.com/"
         },
         {
             "title": "NuGet",
@@ -4570,6 +4585,11 @@
             "hex": "F86001",
             "source": "https://www.pjsip.org/favicon.ico"
         },
+        {
+            "title": "Planet",
+            "hex": "009DB1",
+            "source": "https://www.planet.com/explorer/"
+        },
         {
             "title": "PlanGrid",
             "hex": "0085DE",