bump version to 5.2b1

diff --git a/lib/yaml/__init__.py b/lib/yaml/__init__.py
index 09f82cd..85db1db 100644
--- a/lib/yaml/__init__.py
+++ b/lib/yaml/__init__.py
@@ -8,7 +8,7 @@
 from loader import *
 from dumper import *
 
-__version__ = '5.1.2'
+__version__ = '5.2b1'
 
 try:
     from cyaml import *
diff --git a/lib3/yaml/__init__.py b/lib3/yaml/__init__.py
index a31f279..6116109 100644
--- a/lib3/yaml/__init__.py
+++ b/lib3/yaml/__init__.py
@@ -8,7 +8,7 @@
 from .loader import *
 from .dumper import *
 
-__version__ = '5.1.2'
+__version__ = '5.2b1'
 try:
     from .cyaml import *
     __with_libyaml__ = True
diff --git a/setup.py b/setup.py
index 5cb0b6d..8a3e215 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 
 NAME = 'PyYAML'
-VERSION = '5.1.2'
+VERSION = '5.2b1'
 DESCRIPTION = "YAML parser and emitter for Python"
 LONG_DESCRIPTION = """\
 YAML is a data serialization format designed for human readability