Avoid dangling sentence in cover letter

Prevents LaTeX from splitting the first sentence of the last paragraph
from the rest of the content on another page.

Closes #84

manuscript/cover-letter/cover-letter.tex

@@ -69,7 +69,7 @@
 Given the robust performance of these methods across simulated and natural virus populations, distinct evolutionary time periods, and a wide range of method parameters, researchers and practitioners could immediately apply these methods to other viral pathogens.
 Our open source implementation of these methods supports such applications by integrating easily with existing workflows for genomic epidemiology.
 We expect this general approach to provide the foundation for future methods that formally identify reassortant or recombinant lineages.
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 This work builds on a long history of past PLOS Computational Biology publications that have applied dimensionality reduction methods to biological systems and rigorously evaluated the accuracy and interpretability of such methods.
 Our findings highlight the value of continuing this line of research and should be relevant to an audience of evolutionary biologists, infectious disease researchers, and computational biologists as well as public health practitioners.
 For these reasons, we would appreciate your consideration for publication in PLOS Computational Biology.