Merge pull request #320 from github/simon-engledew/fix-DEP0005-buffer

Fix deprecated method Buffer.new

Author: Simon Engledew

lib/tracer-config.js

@@ -133,7 +133,7 @@ export function concatTracerConfigs(
   for (const e of Object.entries(env)) {
     const key = e[0];
     const value = e[1];
-    const lineBuffer = new Buffer(`${key}=${value}\0`, "utf8");
+    const lineBuffer = Buffer.from(`${key}=${value}\0`, "utf8");
     const sizeBuffer = Buffer.alloc(4);
     sizeBuffer.writeInt32LE(lineBuffer.length, 0);
     buffer = Buffer.concat([buffer, sizeBuffer, lineBuffer]);