Update libraries to official release versions

Author: thunderbiscuit

bdk-android/gradle.properties

@@ -2,4 +2,4 @@ org.gradle.jvmargs=-Xmx1536m
 android.useAndroidX=true
 android.enableJetifier=true
 kotlin.code.style=official
-libraryVersion=0.31.0-SNAPSHOT
+libraryVersion=0.31.0

bdk-jvm/gradle.properties

@@ -1,4 +1,4 @@
 org.gradle.jvmargs=-Xmx1536m
 android.enableJetifier=true
 kotlin.code.style=official
-libraryVersion=0.31.0-SNAPSHOT
+libraryVersion=0.31.0

bdk-python/setup.py

@@ -51,7 +51,7 @@
 
 setup(
     name="bdkpython",
-    version="0.31.0.dev0",
+    version="0.31.0",
     description="The Python language bindings for the Bitcoin Development Kit",
     long_description=LONG_DESCRIPTION,
     long_description_content_type="text/markdown",