Update year to 2020 in scripts and readme (#2705)

Author: rbuch

README.md

@@ -359,4 +359,4 @@ Ronak Buch, Michael Robson, Eric Mikida, Sam White, Juan Galvez, Nitin Bhat,
 Kavitha Chandrasekar, Jaemin Choi, Matthias Diener, Evan Ramos,
 Raghavendra Kanakagiri, and Venkatasubrahmanian Narayanan.
 
-Copyright (C) 1989-2019 Regents of the University of Illinois
+Copyright (C) 1989-2020 Regents of the University of Illinois

doc/conf.py

@@ -20,7 +20,7 @@
 # -- Project information -----------------------------------------------------
 
 project = 'Charm++'
-copyright = '2019, PPL'
+copyright = '2020, PPL'
 author = 'PPL'
 
 # The short X.Y version

src/scripts/charmc

@@ -155,7 +155,7 @@ printUsage() {
     echo "and Charm++ programs.  The flags generally match those of cc or f77."
     echo "  Other options that are not listed here will be passed directly to the"
     echo "underlying compiler and/or linker."
-    echo "Parallel Programming Lab, UIUC, 2019."
+    echo "Parallel Programming Lab, UIUC, 2020."
     echo $*
     exit 1
 }