updates zenodo badge for SPECFEM2D v8.1.0 #105

Job	Run time
Check file changes	16s
Test on ubuntu-latest	1m 8s
Test on ubuntu-20.04	1m 12s
Test on Mac	4m 14s
Test Intel on ubuntu-20.04	5m 12s
Test run example 0 - make tests	2m 14s
Test run example 3 - benchmark claerbout kernel elastic SH	2m 38s
Test run example 1 - benchmark claerbout kernel acoustic	2m 19s
Test run example 2 - benchmark claerbout kernel elastic P-SV	2m 28s
Test run example 11 - tomographic_ocean_model	1m 22s
Test run example 5 - moving sources	1m 39s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 13s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	3m 19s
Test run example 6 - anisotropy	1m 20s
Test run example 7 - Industrial_Format_SEP	4m 16s
Test run example 8 - axisymmetric_case_AXISYM_option	2m 2s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 33s
	40m 25s

Provide feedback