Messed up the bibentry comma, fixing

inst/CITATION

@@ -13,7 +13,7 @@ bibentry(
   pages = "1--30",
   doi = "10.18637/jss.v038.i07",
   url = "https://www.jstatsoft.org/v38/i07/",
-  key = "mstate-JSS-2011"
+  key = "mstateJSS2011",
   textVersion  =
   paste("Liesbeth C. de Wreede, Marta Fiocco, Hein Putter (2011).",
         "mstate: An R Package for the Analysis of Competing Risks and Multi-State Models.",
@@ -31,7 +31,7 @@ bibentry(
   year = "2010",
   volume = "99",
   pages = "261--274",
-  key = "mstate-compmethods-2010"
+  key = "mstateCompMethods2010",
   textVersion =
   paste("Liesbeth C. de Wreede, Marta Fiocco, Hein Putter (2010)",
         "The {mstate} Package for Estimation and Prediction in Non- and Semi-Parametric Multi-State and Competing Risks Models.",
@@ -48,7 +48,7 @@ bibentry(
   year = "2007",
   number = "26",
   pages = "2389--2430",
-  key = "mstate-tutorial-2007"
+  key = "mstateTutorial2007",
   textVersion =
   paste("Hein Putter, Marta Fiocco, and Ronald B. Geskus (2007)",
         "Tutorial in Biostatistics: Competing Risks and Multi-State Models.",