Rename opentelemetry source branch to main

prondubuisi · prondubuisi · commit c586fb5551d6 · 2021-03-11T05:55:03.000+01:00
diff --git a/composer.json b/composer.json
@@ -4,7 +4,7 @@
   "type": "library",
   "license": "MIT",
   "require": {
-    "open-telemetry/opentelemetry": "dev-master"
+    "open-telemetry/opentelemetry": "dev-main"
   },
   "autoload": {
     "psr-4": {
