tag: add underscore to `from` function

The majority of functions are named `from_something` (with an
underscore) instead of `fromsomething`.  Update the tag function for
consistency with the rest of the library.

include/git2/deprecated.h

@@ -291,6 +291,12 @@ GIT_EXTERN(int) git_index_add_frombuffer(
 #define GIT_REF_FORMAT_REFSPEC_PATTERN GIT_REFERENCE_FORMAT_REFSPEC_PATTERN
 #define GIT_REF_FORMAT_REFSPEC_SHORTHAND GIT_REFERENCE_FORMAT_REFSPEC_SHORTHAND
 
+GIT_EXTERN(int) git_tag_create_frombuffer(
+	git_oid *oid,
+	git_repository *repo,
+	const char *buffer,
+	int force);
+
 /**@}*/
 
 /** @name Deprecated Credential Callback Types

include/git2/tag.h

@@ -217,7 +217,7 @@ GIT_EXTERN(int) git_tag_annotation_create(
  * @param force Overwrite existing tags
  * @return 0 on success; error code otherwise
  */
-GIT_EXTERN(int) git_tag_create_frombuffer(
+GIT_EXTERN(int) git_tag_create_from_buffer(
 	git_oid *oid,
 	git_repository *repo,
 	const char *buffer,

src/tag.c

@@ -328,7 +328,7 @@ int git_tag_create_lightweight(
 	return git_tag_create__internal(oid, repo, tag_name, target, NULL, NULL, allow_ref_overwrite, 0);
 }
 
-int git_tag_create_frombuffer(git_oid *oid, git_repository *repo, const char *buffer, int allow_ref_overwrite)
+int git_tag_create_from_buffer(git_oid *oid, git_repository *repo, const char *buffer, int allow_ref_overwrite)
 {
 	git_tag tag;
 	int error;
@@ -521,3 +521,10 @@ int git_tag_peel(git_object **tag_target, const git_tag *tag)
 {
 	return git_object_peel(tag_target, (const git_object *)tag, GIT_OBJECT_ANY);
 }
+
+/* Deprecated Functions */
+
+int git_tag_create_frombuffer(git_oid *oid, git_repository *repo, const char *buffer, int allow_ref_overwrite)
+{
+	return git_tag_create_from_buffer(oid, repo, buffer, allow_ref_overwrite);
+}