Avoid syntax error for insecure key (#45)

According to the docs: https://opentelemetry.io/docs/collector/configuration/#exporters the insecure key should be inside tls key otherwise the service doesn't start.

examples/basic_elixir/otel-collector-config.yaml

@@ -14,6 +14,7 @@ exporters:
     endpoint: "http://zipkin:9411/api/v2/spans"
   jaeger:
     endpoint: jaeger-all-in-one:14250
+    tls:
       insecure: true
 extensions:
   zpages: {}