fix typo (#86)

* fix typo in docstring of unsafe_resize!

* set version to 2.12.1

Author: ranocha

Project.toml

@@ -1,7 +1,7 @@
 name = "RootedTrees"
 uuid = "47965b36-3f3e-11e9-0dcf-4570dfd42a8c"
 authors = ["Hendrik Ranocha <mail@ranocha.de> and contributors"]
-version = "2.12.0"
+version = "2.12.1"
 
 [deps]
 Latexify = "23fbe1c1-3f47-55db-b15f-69d7ec21a316"

src/RootedTrees.jl

@@ -124,7 +124,7 @@ Resize the rooted tree `t` to `n` nodes. This is an unsafe operation
 since the rooted tree will not necessarily be in canonical representation
 afterwards, even if the corresponding flag of `t` is set. Use with caution!
 
-!!! warn "Internal interface"
+!!! warning "Internal interface"
     This function is considered to be an internal implementation detail and
     will not necessarily be stable.
 """