Swift 4.1.2 support, adds 4.2 builds (#45)

* Swift 4.1.2 support, adds 4.2 builds

* Removed if statement for Linux Unicode differences are fixed

.swift-version

@@ -1 +1 @@
-4.0
+4.1.2

.travis.yml

@@ -20,6 +20,13 @@ matrix:
       dist: trusty
       sudo: required
       env: SWIFT_SNAPSHOT=4.0
+    - os: linux
+      dist: trusty
+      sudo: required
+    - os: linux
+      dist: trusty
+      sudo: required
+      env: SWIFT_SNAPSHOT=swift-4.2-DEVELOPMENT-SNAPSHOT-2018-07-01-a
     - os: osx
       osx_image: xcode8.3
       sudo: required
@@ -28,6 +35,13 @@ matrix:
       osx_image: xcode9
       sudo: required
       env: SWIFT_SNAPSHOT=4.0
+    - os: osx
+      osx_image: xcode9.4
+      sudo: required
+    - os: osx
+      osx_image: xcode9.4
+      sudo: required
+      env: SWIFT_SNAPSHOT=swift-4.2-DEVELOPMENT-SNAPSHOT-2018-06-04-a  
 
 before_install:
     - git clone https://github.com/IBM-Swift/Package-Builder.git

README.md

@@ -30,7 +30,7 @@ API documentation for `HTMLEntities` is located [here](https://ibm-swift.github.
 
 ## Version Info
 
-Latest release of `HTMLEntities` runs on Swift 3 and 4. Tested on Swift 3.1.1 and Swift 4.0 toolchains.
+Latest release of `HTMLEntities` runs on Swift 3 and 4. Tested on Swift 3.1.1 and Swift 4.0+ toolchains.
 
 ## Installation
 

Tests/HTMLEntitiesTests/HTMLEntitiesTests.swift

@@ -33,11 +33,6 @@ let str3Escaped = "Jako efektivnější se nám jev&iacu
 
 class HTMLEntitiesTests: XCTestCase {
     func testNamedCharacterReferences() {
-#if os(Linux)
-        XCTAssertEqual(namedCharactersEncodeMap.count, 1367)
-#else
-        XCTAssertEqual(namedCharactersEncodeMap.count, 1509)
-#endif
 
         XCTAssertEqual(specialNamedCharactersDecodeMap.count, 2)
         XCTAssertEqual(legacyNamedCharactersDecodeMap.count, 106)