Replace non-ASCII apostrophe (#392)

In some environments, a non-ASCII character causes a failure when pip installing datadog. I could not replicate on my local OSX machine, but I have a Docker image based on Alpine Linux that fails reliably with the character in the README.
DataDog · Jun 11, 2019 · ce21d49 · ce21d49
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commit ce21d49
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -95,7 +95,7 @@ Thread Safety
 Origin detection over UDP
 -------------
 Origin detection is a method to detect which pod `DogStatsD` packets are coming from in order to add the pod's tags to the tag list.
-The `DogStatsD` client attaches an internal tag, `entity_id`. The value of this tag is the content of the `DD_ENTITY_ID` environment variable if found, which is the pod’s UID.
+The `DogStatsD` client attaches an internal tag, `entity_id`. The value of this tag is the content of the `DD_ENTITY_ID` environment variable if found, which is the pod's UID.
 This tag will be used by the Datadog Agent to insert container tags to the metrics. You should only `append` to the `constant_tags` list to avoid overwriting this global tag.
 
 To enable origin detection over UDP, add the following lines to your application manifest