Update link from Bitbucket to GitHub

Signed-off-by: jkyeung <gallium.arsenide@gmail.com>

Author: jkyeung

README.md

@@ -38,7 +38,7 @@ iLibCall and 64-bit Support
 
 :rotating_light: WARNING WARNING WARNING :rotating_light:
 
-Due to limitations in XMLSERVICE, using iLibCall in a 64-bit process results in failure. See [this bug](https://bitbucket.org/litmis/python-itoolkit/issues/17/ilibcall-fails-on-64-bt-python-versions) for more info.
+Due to limitations in XMLSERVICE, using iLibCall in a 64-bit process results in failure. See [this bug](https://github.com/IBM/python-itoolkit/issues/17) for more info.
 
 Documentation
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