bump Depends: R to 3.6, reticulate to 1.31

Author: t-kalinowski

DESCRIPTION

@@ -26,10 +26,10 @@ License: MIT + file LICENSE
 URL: https://tensorflow.rstudio.com/
 BugReports: https://github.com/rstudio/keras/issues
 Depends:
-    R (>= 3.4)
+    R (>= 3.6)
 Imports:
     generics (>= 0.0.1),
-    reticulate (>= 1.30.9000),
+    reticulate (>= 1.31),
     tensorflow (>= 2.8.0),
     tfruns (>= 1.0),
     magrittr,
@@ -51,5 +51,3 @@ Suggests:
 Roxygen: list(markdown = TRUE, r6 = FALSE)
 RoxygenNote: 7.2.3
 VignetteBuilder: knitr
-Remotes: 
-    rstudio/reticulate