updates zenodo badge for SPECFEM2D v8.1.0 #106

Job	Run time
Check file changes	18s
Test on ubuntu-latest	1m 10s
Test on ubuntu-20.04	1m 12s
Test on Mac	6m 57s
Test Intel on ubuntu-20.04	4m 57s
Test run example 2 - benchmark claerbout kernel elastic P-SV	2m 34s
Test run example 1 - benchmark claerbout kernel acoustic	2m 11s
Test run example 0 - make tests	2m 7s
Test run example 3 - benchmark claerbout kernel elastic SH	2m 53s
Test run example 11 - tomographic_ocean_model	1m 20s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 10s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	2m 30s
Test run example 5 - moving sources	1m 44s
Test run example 6 - anisotropy	1m 15s
Test run example 7 - Industrial_Format_SEP	4m 8s
Test run example 8 - axisymmetric_case_AXISYM_option	1m 52s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 9s
	41m 27s

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