generate_badge() fails

Hi Karthik!
When I try to run `generate_badge()` it gives me the following error message:

> Error: Invalid block specification.
> Must start with `` and end with ``

My session info is:

> sessionInfo()
> R version 4.0.3 (2020-10-10)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
> Running under: Windows 10 x64 (build 18363)
>
> Matrix products: default
>
> locale:
> [1] LC_COLLATE=German_Germany.1252 LC_CTYPE=German_Germany.1252
> [3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C
> [5] LC_TIME=German_Germany.1252
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> other attached packages:
> [1] holepunch_0.1.28.9000
>
> loaded via a namespace (and not attached):
> [1] cliapp_0.1.1 Rcpp_1.0.5 git2r_0.27.1 pillar_1.4.6
> [5] compiler_4.0.3 prettyunits_1.1.1 remotes_2.2.0 tools_4.0.3
> [9] progress_1.2.2 packrat_0.5.0 pkgbuild_1.1.0 lifecycle_0.2.0
> [13] tibble_3.0.4 jsonlite_1.7.1 lubridate_1.7.9 pkgconfig_2.0.3
> [17] rlang_0.4.8 cli_2.1.0 rstudioapi_0.11 curl_4.3
> [21] withr_2.3.0 stringr_1.4.0 httr_1.4.2 xml2_1.3.2
> [25] desc_1.2.0 generics_0.0.2 vctrs_0.3.4 fs_1.5.0
> [29] hms_0.5.3 rprojroot_1.3-2 glue_1.4.2 R6_2.4.1
> [33] gh_1.1.0 processx_3.4.4 fansi_0.4.1 callr_3.5.0
> [37] selectr_0.4-2 magrittr_1.5 ellipsis_0.3.1 usethis_1.6.3
> [41] backports_1.1.10 ps_1.4.0 assertthat_0.2.1 renv_0.12.0
> [45] ini_0.3.1 stringi_1.5.3 crayon_1.3.4

Hope this helps.
This looks like an awesome project and I would love to make it run for me as well :)

Cheers from across the pond,
Sebastian

Start by reproducing the failure in generate_badge() using the reported R and Windows context, then inspect how it validates the badges block. Compare the input with the required start and end markers; done means the reported invocation no longer fails unexpectedly or the expected format is clearly established.

Written by the indexing model from the issue text.