readme and license updates

Author: jacobwilliams

LICENSE.txt

@@ -1,7 +1,7 @@
 LSQR: Sparse Least Squares Solver with Modern Fortran
 https://github.com/jacobwilliams/LSQR
 
-Copyright (c) 2019, Jacob Williams
+Copyright (c) 2019-2021, Jacob Williams
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,

README.md

@@ -69,7 +69,7 @@ The lsqr source code and related files and documentation are distributed under a
 
 ### References
 
-* The original Fortran 77 version of this algorithm can be found here: https://web.stanford.edu/group/SOL/software/lsqr/ The updated version has been significantly refactored.
+* The original Fortran 77 version of this algorithm can be found here: [https://web.stanford.edu/group/SOL/software/lsqr/](https://web.stanford.edu/group/SOL/software/lsqr/) The updated version has been significantly refactored.
 * C.C. Paige and M.A. Saunders,  [LSQR: An algorithm for sparse linear equations and sparse least squares](https://stanford.edu/group/SOL/software/lsqr/lsqr-toms82a.pdf), ACM Transactions on Mathematical Software 8, 1 (March 1982), pp. 43-71.
 * C.C. Paige and M.A. Saunders,  [Algorithm 583, LSQR: Sparse linear equations and least-squares problems](https://web.stanford.edu/group/SOL/software/lsqr/lsqr-toms82b.pdf), ACM Transactions on Mathematical Software 8, 2 (June 1982), pp. 195-209.
 * C.L. Lawson, R.J. Hanson, D.R. Kincaid and F.T. Krogh, [Basic linear algebra subprograms for Fortran usage](https://dl.acm.org/citation.cfm?id=355847), ACM Transactions on Mathematical Software 5, 3 (Sept 1979), pp. 308-323 and 324-325.