Use TLS MinVersion, not MaxVersion, in documentation and code examples

Let the examples pin the minimum supported TLS version, not the maximum.
This will prevent connections to TLS 1.0.

I removed InsecureSkipVerify from the examples so that users to don't inadvertently
copy this insecure setup into their applications.

Closes #26

Author: andrewkroh

README.md

@@ -115,8 +115,8 @@ cfg := elasticsearch.Config{
     ResponseHeaderTimeout: time.Second,
     DialContext:           (&net.Dialer{Timeout: time.Second}).DialContext,
     TLSClientConfig: &tls.Config{
-      MaxVersion:         tls.VersionTLS11,
-      InsecureSkipVerify: true,
+      MinVersion: tls.VersionTLS11,
+      // ...
     },
   },
 }

_examples/configuration.go

@@ -27,8 +27,8 @@ func main() {
 			ResponseHeaderTimeout: time.Millisecond,
 			DialContext:           (&net.Dialer{Timeout: time.Nanosecond}).DialContext,
 			TLSClientConfig: &tls.Config{
-				MaxVersion:         tls.VersionTLS11,
-				InsecureSkipVerify: true,
+				MinVersion: tls.VersionTLS11,
+				// ...
 			},
 		},
 	}
@@ -38,5 +38,6 @@ func main() {
 		log.Printf("Error creating the client: %s", err)
 	} else {
 		log.Println(es.Info())
+		// => dial tcp: i/o timeout
 	}
 }

doc.go

@@ -20,8 +20,7 @@ To configure the client, pass a Config object to the NewClient function:
 		    ResponseHeaderTimeout: time.Second,
 		    DialContext:           (&net.Dialer{Timeout: time.Second}).DialContext,
 		    TLSClientConfig: &tls.Config{
-		      MaxVersion:         tls.VersionTLS11,
-		      InsecureSkipVerify: true,
+		      MinVersion:         tls.VersionTLS11,
 		    },
 		  },
 		}

elasticsearch_example_test.go

@@ -42,8 +42,7 @@ func ExampleNewClient() {
 			ResponseHeaderTimeout: time.Second,
 			DialContext:           (&net.Dialer{Timeout: time.Second}).DialContext,
 			TLSClientConfig: &tls.Config{
-				MaxVersion:         tls.VersionTLS11,
-				InsecureSkipVerify: true,
+				MinVersion:         tls.VersionTLS11,
 			},
 		},
 	}

elasticsearch_integration_test.go

@@ -125,7 +125,7 @@ func TestClientTransport(t *testing.T) {
 				ResponseHeaderTimeout: time.Second,
 				DialContext:           (&net.Dialer{Timeout: time.Nanosecond}).DialContext,
 				TLSClientConfig: &tls.Config{
-					MaxVersion:         tls.VersionTLS11,
+					MinVersion:         tls.VersionTLS11,
 					InsecureSkipVerify: true,
 				},
 			},