make build reproducible

debian/patches/reproducible_build.diff

+Index: node-d3-random/rollup.config.js
+===================================================================
+--- node-d3-random.orig/rollup.config.js	2019-06-24 00:42:37.826167478 -0700
++++ node-d3-random/rollup.config.js	2019-06-24 00:43:44.324977814 -0700
+@@ -9,7 +9,7 @@
+     format: "umd",
+     indent: false,
+     extend: true,
+-    banner: `// ${meta.homepage} v${meta.version} Copyright ${(new Date).getFullYear()} ${meta.author.name}`,
++    banner: `// ${meta.homepage} v${meta.version} Copyright ${(new Date(process.env.SOURCE_DATE_EPOCH ? (process.env.SOURCE_DATE_EPOCH * 1000) : new Date().getTime())).getFullYear()} ${meta.author.name}`,
+     globals: Object.assign({}, ...Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key)).map(key => ({[key]: "d3"})))
+   },
+   plugins: []

debian/patches/series

+fix_rollup.diff
+reproducible_build.diff