[blog post][okhttp4_blog_post] to explain it.

 *  Fix: Target Java 8 bytecode for Java and Kotlin.


## Version 4.0.0-RC3

_2019-06-24_

 *  Fix: Retain binary-compatibility in `okhttp3.internal.HttpMethod`. Naughty third party SDKs
    import this and we want to ease upgrades for their users.


## Version 4.0.0-RC2

_2019-06-21_

 *  New: Require Kotlin 1.3.40.

	req.URL.RawQuery = strings.ReplaceAll(req.URL.Query().Encode(), "+", "%20")

	// Get canonical URI.
	canonicalURI := s3utils.EncodePath(req.URL.Path)

	// Get canonical request.
	// canonicalRequest =
	//  <HTTPMethod>\n
	//  <CanonicalURI>\n
	//  <CanonicalQueryString>\n
	//  <CanonicalHeaders>\n
	//  <SignedHeaders>\n
	//  <HashedPayload>
	//
	canonicalRequest := strings.Join([]string{
		req.Method,

HSPLokhttp3/internal/http/HttpHeaders;->promisesBody(Lokhttp3/Response;)Z
HSPLokhttp3/internal/http/HttpHeaders;->receiveHeaders(Lokhttp3/CookieJar;Lokhttp3/HttpUrl;Lokhttp3/Headers;)V
HSPLokhttp3/internal/http/HttpMethod;->permitsRequestBody(Ljava/lang/String;)Z
HSPLokhttp3/internal/http/RealInterceptorChain;-><init>(Lokhttp3/internal/connection/RealCall;Ljava/util/List;ILokhttp3/internal/connection/Exchange;Lokhttp3/Request;III)V