Incremented version to 2.0-rc1. (#282)

Signed-off-by: dblock <[email protected]>

Author: dblock

build.gradle

@@ -9,10 +9,10 @@ buildscript {
     ext {
         opensearch_group = "org.opensearch"
         isSnapshot = "true" == System.getProperty("build.snapshot", "true")
-        opensearch_version = System.getProperty("opensearch.version", "2.0.0-alpha1-SNAPSHOT")
-        buildVersionQualifier = System.getProperty("build.version_qualifier", "alpha1")
+        opensearch_version = System.getProperty("opensearch.version", "2.0.0-rc1-SNAPSHOT")
+        buildVersionQualifier = System.getProperty("build.version_qualifier", "rc1")
 
-        // 2.0.0-alpha1-SNAPSHOT -> 2.0.0.0-alpha1-SNAPSHOT
+        // 2.0.0-rc1-SNAPSHOT -> 2.0.0.0-rc1-SNAPSHOT
         version_tokens = opensearch_version.tokenize('-')
         opensearch_build = version_tokens[0] + '.0'
         if (buildVersionQualifier) {