ANALISIS KONDISI FINANCIAL DISTRESS MENGGUNAKAN METODE ALTMAN, SPRINGATE, ZMIJEWSKI DAN GROVER TERHADAP RASIO KEUANGAN PADA PERUSAHAAN SEKTOR PERTAMBANGAN BATUBARA YANG TERLISTING DI BURSA EFEK INDONESIA PERIODE 2014 - 2018 = FINANCIAL DISTRESS CONDITION ANALYSIS USING ALTMAN, SPRINGATE, ZMIJEWSKI AND GROVER METHODS ON FINANCIAL RATIOS IN COAL MINING SECTOR COMPANIES LISTED IN BURSA EFEK INDONESIA PERIOD 2014 - 2018