update version for beta3 (#2316)

.props/_GlobalStaticVersion.props

@@ -13,7 +13,7 @@
     <SemanticVersionMajor>2</SemanticVersionMajor>
     <SemanticVersionMinor>18</SemanticVersionMinor> <!-- If changing the Minor version, also update the Date value. -->
     <SemanticVersionPatch>0</SemanticVersionPatch>
-    <PreReleaseMilestone>beta2</PreReleaseMilestone> <!--Valid values: beta1, beta2, EMPTY for stable -->
+    <PreReleaseMilestone>beta3</PreReleaseMilestone> <!--Valid values: beta1, beta2, EMPTY for stable -->
     <PreReleaseMilestone Condition="'$(NightlyBuild)' == 'True'">nightly</PreReleaseMilestone> <!-- Overwrite this property for nightly builds from the DEVELOP branch. -->
     <!-- 
       Date when Semantic Version was changed.