add reference to cwl-utils and fix typos in paper.md

Author: ntachukwu

paper/paper.bib

@@ -26,4 +26,13 @@ @misc{miniwdl
   publisher = {GitHub},
   journal = {GitHub repository},
   url = {https://github.com/chanzuckerberg/miniwdl/}
+}
+
+@misc{cwl_utils,
+  author = {CWL Community},
+  title = {cwl-utils},
+  year = {2019},
+  publisher = {GitHub},
+  journal = {GitHub repository},
+  url = {https://github.com/common-workflow-language/cwl-utils}
 }

paper/paper.md

@@ -33,7 +33,7 @@ The ``wdl2cwl`` package uses the ``miniwdl`` package [@miniwdl], an open-source,
 developer toolkit and local runner for running wdl files. The ``wdl2cwl`` package was
 designed to provide a class-based and developer-friendly interface for extracting 
 the various sections of a wdl file, dynamically create the various objects
-needed to create a valid cwl file ( this is done using the ``cwl.utils`` package [@cwl.utils], 
+needed to create a valid cwl file ( this is done using the ``cwl.utils`` package [@cwl_utils], 
 an open-source, Python package for parsing cwl files) and performing error checking 
 for valid imports, input declarations, expressions etc.
 
@@ -48,6 +48,6 @@ that can be used by users of either languages and so much more.
 
 # Acknowledgements
 
-We acknowledge the work by tthe developers of miniwdl, cwl, wdl
+We acknowledge the work by the developers of miniwdl, CWL and WDL.
 
 # References