Upgrade to commons-lang3 3.8

New features:
o LANG-1355: TimeZone.getTimeZone() in FastDateParser causes resource contention (PR #296.) Thanks to Chas Honton.
o LANG-1360: Add methods to ObjectUtils to get various forms of class names in a null-safe manner Thanks to Gary Gregory.

Fixed Bugs:
o LANG-1362: Fix tests DateUtilsTest for Java 9 with en_GB locale Thanks to Stephen Colebourne.
o LANG-1365: Fix NullPointerException in isJavaVersionAtLeast on Java 10, add SystemUtils.IS_JAVA_10, add JavaVersion.JAVA_10 Thanks to Gary Gregory.
o LANG-1348: StackOverflowError on TypeUtils.toString(...) for a generic return type of Enum.valueOf Thanks to mbusso.
o LANG-1350: ConstructorUtils.invokeConstructor(Class, Object...) regression Thanks to Brett Kail.
o LANG-1349: EqualsBuilder#isRegistered: swappedPair construction bug Thanks to Naman Nigam.
o LANG-1357: org.apache.commons.lang3.time.FastDateParser should use toUpperCase(Locale) Thanks to BruceKuiLiu.

Changes:
o LANG-1358: Improve StringUtils#replace throughput Thanks to Stephane Landelle.
o LANG-1346: Remove deprecation from RandomStringUtils
o LANG-1361: ExceptionUtils.getThrowableList() is using deprecated ExceptionUtils.getCause() Thanks to Ana.