Release time.

Calling it 0.7.0 because the fullscreen (cursor/utf8) infrasructure is in now.
diff --git a/main.c b/main.c
index e95c641..6dd4cea 100644
--- a/main.c
+++ b/main.c
@@ -6,7 +6,7 @@
 #include "toys.h"
 
 #ifndef TOYBOX_VERSION
-#define TOYBOX_VERSION "0.6.1"
+#define TOYBOX_VERSION "0.7.0"
 #endif
 
 // Populate toy_list[].