Update version number to v0.26

CHANGELOG.md

-v0.25 + 1
--------
+v0.26 + 1
+---------
+
+### Changes or improvements
+
+### API additions
+
+### API removals
+
+### Breaking API changes
+
+v0.26
+-----
 
 ### Changes or improvements
 
@@ -85,8 +96,6 @@ v0.25 + 1
 * `git_transport_smart_proxy_options()' enables you to get the proxy options for
   smart transports.
 
-### API removals
-
 ### Breaking API changes
 
 * `clone_checkout_strategy` has been removed from

include/git2/version.h

@@ -7,12 +7,12 @@
 #ifndef INCLUDE_git_version_h__
 #define INCLUDE_git_version_h__
 
-#define LIBGIT2_VERSION "0.25.0"
+#define LIBGIT2_VERSION "0.26.0"
 #define LIBGIT2_VER_MAJOR 0
-#define LIBGIT2_VER_MINOR 25
+#define LIBGIT2_VER_MINOR 26
 #define LIBGIT2_VER_REVISION 0
 #define LIBGIT2_VER_PATCH 0
 
-#define LIBGIT2_SOVERSION 25
+#define LIBGIT2_SOVERSION 26
 
 #endif