changes SQLiteBulkCopy to SqliteBulkCopy to use same style as for SqliteQuery

[clatze]

it is a minor, but I personally think we should follow the same style for commands, not like this:

Get-Command -Module PSSQLite

CommandType Name Version Source

---

Function Invoke-SQLiteBulkCopy 1.0.3 PSSQLite
Function Invoke-SqliteQuery 1.0.3 PSSQLite
Function New-SQLiteConnection 1.0.3 PSSQLite
Function Out-DataTable 1.0.3 PSSQLite

So I changed Invoke-SQLiteBulkCopy to Invoke-SqliteBulkCopy