Typo fix

util/README.md

@@ -8,7 +8,7 @@
 1. The numbers in test-numbers.js and random numbers for precision and rounding mode are passed to pre-compiled java programs
 that are in com folder. 
 2. The java programs parse command line arguments, build BigDecimals with them, compute the result and print the result to the console.
-3. The [test case generator script](generateTestFiles.js) check for stderr of java program.
+3. The [test case generator script](generateTestFiles.js) checks for stderr of java program.
 4. If stderr is non-empty, an error is thrown from java program; in that case the result becomes `errorThrown` which means Nodejs version of
 BigDecimal library should also throw an error. Errors are thrown in case of rounding errors etc.
 5. [In the test generator script](generateTestFiles.js) there are operations with one operator such as absolute value and square root,