Fix --as-cran NOTE about ArXiv URLs

Found the following (possibly) invalid URLs:
  URL: https://arxiv.org/pdf/2106.12367.pdf (moved to http://arxiv.org/pdf/2106.12367)
    From: README.md
    Status: 200
    Message: OK
  URL: https://arxiv.org/pdf/2204.03285.pdf (moved to http://arxiv.org/pdf/2204.03285)
    From: README.md
    Status: 200
    Message: OK

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: ElliptCopulas
 Type: Package
 Title: Inference of Elliptical Distributions and Copulas
-Version: 0.1.4
+Version: 0.1.4.1
 Description: Provides functions for the simulation and
   the nonparametric estimation of elliptical distributions,
   meta-elliptical copulas and trans-elliptical distributions,

README.Rmd

@@ -155,7 +155,7 @@ convert between
 # References
 
 Derumigny, A., & Fermanian, J. D. (2022). Identifiability and estimation of meta-elliptical copula generators.
-Journal of Multivariate Analysis, article 104962. [doi:10.1016/j.jmva.2022.104962](https://doi.org/doi:10.1016/j.jmva.2022.104962), [arXiv:2106.12367](https://arxiv.org/pdf/2106.12367.pdf).
+Journal of Multivariate Analysis, article 104962. [doi:10.1016/j.jmva.2022.104962](https://doi.org/doi:10.1016/j.jmva.2022.104962), [arXiv:2106.12367](https://arxiv.org/pdf/2106.12367).
 
 Liebscher, E. (2005). A semiparametric density estimator based on elliptical distributions.
 Journal of Multivariate Analysis, 92, 205–225. [doi:10.1016/j.jmva.2003.09.007](https://doi.org/10.1016/j.jmva.2003.09.007).
@@ -167,5 +167,5 @@ elliptical distribution generator.
 
 van der Spek, R., & Derumigny, A. (2022).
 Fast estimation of Kendall's Tau and conditional Kendall's Tau matrices under structural assumptions.
-[arXiv:2204.03285](https://arxiv.org/pdf/2204.03285.pdf).
+[arXiv:2204.03285](https://arxiv.org/pdf/2204.03285).
 

README.md

@@ -154,7 +154,7 @@ Derumigny, A., & Fermanian, J. D. (2022). Identifiability and estimation
 of meta-elliptical copula generators. Journal of Multivariate Analysis,
 article 104962.
 [doi:10.1016/j.jmva.2022.104962](https://doi.org/doi:10.1016/j.jmva.2022.104962),
-[arXiv:2106.12367](https://arxiv.org/pdf/2106.12367.pdf).
+[arXiv:2106.12367](https://arxiv.org/pdf/2106.12367).
 
 Liebscher, E. (2005). A semiparametric density estimator based on
 elliptical distributions. Journal of Multivariate Analysis, 92, 205–225.
@@ -166,4 +166,4 @@ generator. [arxiv:2408.17087](https://arxiv.org/abs/2408.17087).
 
 van der Spek, R., & Derumigny, A. (2022). Fast estimation of Kendall’s
 Tau and conditional Kendall’s Tau matrices under structural assumptions.
-[arXiv:2204.03285](https://arxiv.org/pdf/2204.03285.pdf).
+[arXiv:2204.03285](https://arxiv.org/pdf/2204.03285).