Change default shell flags

[vasigorc]

From this https://github.com/vasigorc/Algorithms/blob/3e84db50c9aa00943873df5828de52f82c5bc06d/Chapter%202%20Sorting/algorithms2_1/src/main/resources/ca/vgorcinschi/algorithms2_4/selectionfilter/selectionFilterRunner.sh#L2

to set -o errexit -o nounset -o pipefail