ref(docs): correct typos in README for clarity

Signed-off-by: Johnny Hujol <itudoben@users.noreply.github.com>

Author: itudoben

README.md

@@ -1,7 +1,6 @@
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-
 # Overview
 ### Description
 JMeter ElasticSearch Backend Listener is a JMeter plugin enabling you to send test results to an ElasticSearch engine. It is meant as an alternative live-monitoring tool to the built-in "InfluxDB" backend listener of JMeter. 
@@ -11,7 +10,7 @@ JMeter ElasticSearch Backend Listener is a JMeter plugin enabling you to send te
 * ElasticSearch low-level REST client
   * Using the low-level client makes the plugin compatible with any ElasticSearch version
 * X-Pack Authentication!
-  * Just supply your crendentials in the specified fields!
+  * Just supply your credentials in the specified fields!
 * Bulk requests
   * By making bulk requests, there are practically no impacts on the performance of the tests themselves. 
 * Filters
@@ -46,7 +45,7 @@ JMeter ElasticSearch Backend Listener is a JMeter plugin enabling you to send te
   * __info__ : Sends all samplers to the ElasticSearch engine, but only sends the headers, body info for the failed samplers.
   * __quiet__ : Only sends the response time, bytes, and other metrics
   * __error__ : Only sends the failing samplers to the ElasticSearch engine (Along with their headers and body information).
-* Use either Kibana or Grafana to vizualize your results!
+* Use either Kibana or Grafana to visualize your results!
   * [Click here to get a sample Grafana dashboard!](https://github.com/delirius325/jmeter-elasticsearch-backend-listener/wiki/JMeter-Generic-Dashboard) - All you need to do is import it into Grafana and change the data source!
 * Continuous Integration support - [Build comparison!](https://github.com/delirius325/jmeter-elasticsearch-backend-listener/wiki/Continuous-Integration---Build-Comparison)
 * Send JMeter variables to ElasticSearch! [Refer to this for more info!](https://github.com/delirius325/jmeter-elasticsearch-backend-listener/wiki/Sending-JMeter-variables)