Change open census to OpenTelemetry in readme file + Update prometheus quick guide in readme (#123)

* Changed open census to OpenTelemetry in readme file

* Added + wildcard, updated sample and readme to reflect sample

README.md

@@ -49,7 +49,7 @@ We encourage contributions. Use tags [up-for-grabs][up-for-grabs-issues] and
 
 ## OpenTelemetry QuickStart: collecting data
 
-You can use Open Census API to instrument code and report data. Or use one of
+You can use OpenTelemetry API to instrument code and report data. Or use one of
 automatic data collection modules.
 
 ### Using ASP.NET Core incoming requests collector
@@ -199,7 +199,7 @@ Configure Prometheus exporter to have stats collected by Prometheus.
 var exporter = new PrometheusExporter(
     new PrometheusExporterOptions()
     {
-        Url = new Uri("http://localhost:9184/metrics/")
+        Url = "http://+:9184/metrics/"
     },
     Stats.ViewManager);
 

samples/Exporters/TestPrometheus.cs

@@ -36,7 +36,7 @@
             var exporter = new PrometheusExporter(
                 new PrometheusExporterOptions()
                 {
-                    Url = "http://localhost:9184/metrics/"
+                    Url = "http://+:9184/metrics/"  // "+" is a wildcard used to listen to all hostnames
                 },
                 Stats.ViewManager);